Question

Me ajudem a resolver:
a) x + 4x =15
b) x + 12 =20

Answer 1

a) x+4x=15
5x=15
x=15/5
x=3

b)x+12=20
x=20-12
x=8

Answer 2

a)X +4x =5x/15=3.
b)X+12=13x/20=0.65