Question

qual o resultado de 7 - (2x + 1) = 3 ?

Answer 1

7 - (2x + 1) = 3

7 - 2x - 1 = 3

- 2x = 3 - 7 + 1

- 2x = - 3

x = $\frac{-3}{-2}$

x =  $\frac{3}{2}$

S = $\{\frac{3}{2}\}$