Question

sendo f(x) = 5x-4/2, determine o valor de x de modo que f(x) = 8.

Answer 1

f(x)=8
(5x-4)/2=8
5x-4=2*8
5x=16+4
5x=20
x=20/5
x=4

Answer 2

8=5x-4/2
8=10x-4
8+4=10x
12=10x
10x=12
x=12/10
x=1,2