We need 20 mixed operations of addition and subtraction of integers, all of which contain multiple brackets

We need 20 mixed operations of addition and subtraction of integers, all of which contain multiple brackets

2x－3y）+（5x+4y）
（8a－7b）－（4a－5b）
－（3x－2y + z）－[5x－(x－2y +z ) －3x]
2（7x2+5x－3）－3（5x2－3x+2）
2b3 +（3ab3－a2b）－2（ab2 + b3）
（－6x2+5xy）－12xy－（2x2－9xy）
(x2-2x3 + 1) - (- 1 + 2x3 + 2x2), where x = 2
3A - [- 2b + (4a-3b)], where a = - 1, B = 3
3ab-4ab+8ab-7ab+ab=
7x-(5x-5y)-y=
23a3bc2-15ab2c+8abc-24a3bc2-8abc=
-7x2+6x+13x2-4x-5x2=
2y+(-2y+5)-(3y+2)＝
(2x2-3xy+4y2)+(x2+2xy-3y2)=
2a-(3a-2b+2)+(3a-4b-1)=
-6x2-7x2+15x2-2x2＝
2x-(x+3y)-(-x-y)-(x-y)＝
2x+2y-[3x-2(x-y)]=
5-(1-x)-1-(x-1)=
Given a = x3-2x2 + x-4, B = 2x3-5x + 3, calculate a + B=
If a = - 0.2, B = 0.5, the value of the algebraic formula - (| A2B | - | AB2 |) is
-(2x2-y2)-[2y2-(x2+2xy)]=
(-y+6+3y4-y3)-(2y2-3y3+y4-7)＝
4x2-[7x2-5x-3(1-2x+x2)]=
3a-(2a-3b)+3(a-2b)-b=
x-[y-2x-(x+y)] =
3x-[y-(2x+y)]=
4a2n-an-(3an-2a2n)＝
2x2y+3xy2-x2+2xy=
-5xm-xm-(-7xm)+(-3xm)=
When a = - 1, B = - 2,
[a-(b-c)]-[-b-(-c-a)]＝
When a = - 1, B = 1, C = - 1,
-[b-2(-5a)]-(-3b+5c)＝
-2(3x+z)-(-6x)+(-5y+3z)=
-5an-an+1-(-7an+1)+(-3an)＝
3a-(2a-4b-6c)+3(-2c+2b)=
9a2+[7a2-2a-(-a2+3a)]=
When 2y-x = 5, 5 (x-2y) 2-3 (- x + 2Y) - 100=