Find some problems of mixed operation of rational number addition and subtraction

Find some problems of mixed operation of rational number addition and subtraction

-5+21*8/2-6-59
68/21-8-11*8+61
-2/9-7/9-56
4.6-(-3/4+1.6-4-3/4)
1/2+3+5/6-7/12
[2/3-4-1/4*(-0.4)]/1/3+2
22+(-4)+(-2)+4*3
-2*8-8*1/2+8/1/8
(2/3+1/2)/(-1/12)*(-12)
(-28)/(-6+4)+(-1)
2/(-2)+0/7-(-8)*(-2)
(1/4-5/6+1/3+2/3)/1/2
18-6/(-3)*(-2)
(5+3/8*8/30/(-2)-3
(-84)/2*(-3)/(-6)
1/2*(-4/15)/2/3
-3x+2y-5x-7y
Happy every day!

The addition and subtraction of rational numbers in the first semester of junior high school. Good, 50 points will be added
(1) (- 7) + (+ 2) (2) (- 3 and 1 / 2) + (- 3.5)
(3) 1 / 4 + (- 1 / 2) (4) (- three and a quarter) + (+ two and a third)
（5）（+15）+（-20）+（+28）+（-10）+（-5）+（-7）
(6) (+ two and three fourths) + (- one and five eighths) + (- 5 / 6) + 3 / 8
(7) (- three and one half) + (- two and one ninth) + 3.5 + (- 8 / 9) + 1 / 2
（8）（-1）+（+2）+（-3）+（-4）+… （-41）+（+42）
(9) (- 1 / 4) - 1 / 4
（10）0-（-3.6）
Okay, 50 more points

1）（-7）+（+2）=-7+2=-5
(2) (- three and a half) + (- 3.5) = - 3.5-3.5 = - 7
（3)　1/4+（-1/2）=1/4-1/2=-1/4
(4) (- three and a quarter) + (+ two and a third) = - 3-1 / 4 + 2 + 1 / 3 = - 1 + 1 / 12 = - 11 / 12
（5）（+15）+（-20）+（+28）+（-10）+（-5）+（-7）=15-20+28-10-5-7=1
(6) (+ two and three fourths) + (- one and five eighths) + (- 5 / 6) + 3 / 8
=2+3/4-1-5/8-5/6+3/8
=1+3/4-1/4-5/6
=1/6+1/2
=2/3
(7) (- three and one half) + (- two and one ninth) + 3.5 + (- 8 / 9) + 1 / 2
=-3-1/2-2-1/9+3+1/2-8/9+1/2
=-Two and a half
（8）（-1）+（+2）+（-3）+（+4）+… （-41）+（+42）=21
(9) (- one and three quarters) - 1 / 4 = - 2
（10）0-（-3.6）=3.6

The rule of rational number subtraction,

Rule of rational number addition: the operation of rational number addition always involves two aspects: one is to determine the sign of the result, the other is to find the absolute value of the result