Question

Qual a conta de 2 (x-1) = 5 ?

Answer 1

2 ( x - 1 ) = 5
2x -2 = 5
2x = 5 + 2
2x = 7
x = 7/2
x = 3,5

Answer 2

2(x-1)=5                           2(3,5-1)=5   prova real

2x-2=5                                7-2=5

2x=5+2                                5=5

x=7/2

x=3,5