Question

calcule as medidas desconhecidas dos angulos das figuras abaixo x+15+3x-5=90

Answer 1

X+15+3x-5=90
x+3x=90-15+5
4x=80
X=80/4
x=20

Answer 2

X+15+3x-5=90
X+3x=90+5-15
4x=95-15
4x=80
X=80/4
X=20