Question

informe o valor de x
A) 2x + 15 = 45
B) 2x - 10 = 20
C) 80 = x + 20
D) 130 = 2x - 10
E) 2x = x + 10

Answer 1

A) 2x = 30 --> x=15

B)2x= 10 --> x= 5

C) 60 = x

D) 120 = 2x --> 60 = x

E) x = 10

Answer 2

a= 15
b= 5
c=60
d=70
e= 10