Question

Calcule a raiz das seguintes equações: a) 5x + 7 = 18 b) x -10 = 21 c) 2x – 9 = -14

Answer 1

$\textsf{Leia abaixo}$

Explicação passo-a-passo:

$\large\boxed{\begin{array}{l} \large\boxed{\begin{array}{l} \rm \: a) \\ \\ \rm \: 5x + 7 = 18 \\ \\ \rm \:5x = 18 - 7 \\ \\ \rm \: 5x = 11 \\ \\ \rm \:x = \dfrac{11}{5} \\\end{array}}\large\boxed{\begin{array}{l} \rm \: b) \\ \\ \rm \: x - 10 = 21 \\ \\ \rm \: x = 21 + 10 \\ \\ \rm \: x = 31 \\ \\ \\ \\ \end{array}}\large\boxed{\begin{array}{l} \rm \: c) \\ \\ \rm \: 2x - 9 = - 14 \\ \\ \rm \: 2x = - 14 + 9 \\ \\ \rm \: 2x = - 5 \\ \\ \rm \: x = \dfrac{ - 5}{2} \\\end{array}}\end{array}}$