3(x-7)-6x=-x 5(x+4)+x=6 7-(2x+3)=9
3(x-7)-6x+x=0 5(x+4)+x-6=0 7-(2x+3)-9=0
3(x-7)-5x=0 (5x+20)+x-6=0 -2-2x-3=0
3x-21-5x=0 5x+20+x-6=0 -5-2x=0
-2x-21=0 6x+14=0 -2x-5=0
-2x=21 6x=-14 -(2x+5)=0
2x=-21 x=(-14):6 ( 2x+5)(-1)=0
x=(-21):2 x=-⁷₃ 2x+5=0
x=-10,5 2x=-5
x=(-5):2
x=-2,5