Question 66181
-3(10x-3)+10(3x-3)=x-7
-30x+9+30x-30=x-7
-21=x-7
x=-21+7
x=-14 solution
proof
-3(10*-14-3)+10(3*-14-3)=-14-7
-3(-140-3)+10(-42-3)=-21
-3*-143+10*-45=-21
429-450=-21
-21=-21