solutions plss:(((:
in any method

1.(2x²+4)+(x²-x)=
2.(x²+x-2)+(5x²+x+8)=
3.(3x²+2x+1)+(x²+x+7)-(2x²+3x+4)=
4.(x²+x+2)-(2x²+3x+4)=
5.(2x²+3x+4)-(x²+x+2)=
6.(3abcd+2xyz)-(7abcd-4xyz)=
7.(x2+x+2)+(x²+x+2)-(2x²+3x+4)=
8.a7(a8)(a)=
9.3m6n⁴(2mn)0(2m²n)=
10.(3abcd)0-1=
11.(3mn+2m+2n)+(5mn-5m-6n)=
12.-5x²y³(2x²y-3x+4y 5)=​