Question

qual o conjunto verdade de 5/2(x+20-x) =20+2x é

a.15
b.25
c.-15
d.-25

com calculo

Answer 1

5/2(x+20-x) =20+2x

5/2 (20)=20+2x

100/2=20+2x
50=20+2x
-2x=-50+20 (-1)
2x=+50-20
2x=30
x=30/2
x=15