Question

resolvar as equações 3 (×-1)+3 (×+4)=-4 (×-10)+40

Answer 1

$3(x-1)+3(x+4)=-4(x-10)+40 \\ \\ 3x-3+3x+12=-4x+40+40 \\ \\ 3x+3x+4x=40+40+3-12 \\ \\ 10x=71 \\ \\ x= \frac{71}{10}$