Répondre :
1/ 3(x+6)=3x+18
x=6
2/ (x²+5x+x+5) +7x+7=
x²+6x+5+7x+7=
x²+13x+12
3/ (2x²+3x+2x+3)-(x²+x-7x-7)=
2x²+3x+2x+3-x²-x+7x+7=
x²+12x+10
4/ idem que le 3
5/ (x-5)²
6/ (6x+2)²
7/ (2x²+x+2x+1)+3x+24=
2x²+6x+25
8/ (8-3x) (8+3x)
x=6
2/ (x²+5x+x+5) +7x+7=
x²+6x+5+7x+7=
x²+13x+12
3/ (2x²+3x+2x+3)-(x²+x-7x-7)=
2x²+3x+2x+3-x²-x+7x+7=
x²+12x+10
4/ idem que le 3
5/ (x-5)²
6/ (6x+2)²
7/ (2x²+x+2x+1)+3x+24=
2x²+6x+25
8/ (8-3x) (8+3x)