Question

resolva a equaçao (X-30+X+X-15)

Answer 1

( X - 30 + X + X - 15 ) =
X - 30 + X + X - 15 =
X - 30 - 15 =
X - 45

Answer 2

X-30+X+X-15=0
X+X+X=30+15
3X=45
X=$\frac{45}{3}$
X=15