7X-20=3(X+5)

7X-20=3(X+5)

7X-20=3(X+5)
7x-20=3x+15
4x=35
x=8.75

In the following formulas: 2x-1 = 0,2 / x = - 2,10x ^ 2 + 7x + 2,5 + (- 3) = 2, x-5y = 1, x ^ 2 + 2x = 1, if the number of equations is m and the number of linear equations is n, then M-N =?

m=4 n=1 m-n=3

2 (x + 8) = 3 (x-1) 8x = - 2 (x + 4) 2x - two thirds (x + 3) = - x + 3 2 (10-0.5y) = - (1.5y + 2)

2（x+8）=3（x-1）
2x+16=3x-3
-x=-19
x=19
8x=-2（x+4）
8x=-2x-8
10x=-8
x=-4/5
2X - two thirds (x + 3) = - x + 3
6x-2(x+3)=-3x+9
6x-2x-6=-3x+9
7x=15
x=15/7
2（10-0.5y）=-（1.5y+2）
20-y=-1.5y-2
0.5y=-22
y=-44