Question

respondam
7x-(14-28)=-21

Answer 1

7x - (14 - 28) = - 21
7x - (- 14) = - 21
7x + 14 = - 21
7x = - 21 - 14
7x = - 35
x = - 35 / 7
x = - 5

Answer 2

$7x - (14 - 28) = - 21 \\ \\ 7x - (-14) = -21 \\ \\ 7x + 14 = -21 \\ \\ 7x = -21 -14 \\ \\ 7x = -35 \\ \\ x = \dfrac{-35}{7} \\ \\ \\ => x = -5$