Question

7 − ( 2 x + 1 ) = 3 (me ajudem por favor!)

Answer 1

7 - (2x + 1) = 3

7 - 2x - 1 = 3

6 - 2x = 3

-2x = 3 - 6

-2x = -3

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

x = 1,5

Answer 2

$7 - (2x + 1) = 3$

Removendo o parênteses

$7 - 2x - 1 = 3$

Calculando

$6 - 2x = 3$

$- 2x = 3 - 6$

$- 2x = - 3$

$2x = 3$

$x = \frac{3}{2} = 1.5$