Question

3) resolva as seguintes equações

a) 5x+45= -5?

b) 21= 3x+24? ​

Answer 1

$\sf Veja\: Abaixo$

Cálculos da A)

$\Large\boxed{\begin{array}{lr} \large \sf \:5x+45=-5 \\ \\ \large \sf \:5x=-5-45 \\ \\ \large \sf \:5x=-50 \\ \\ \large \sf \:x=-\dfrac{50}{5} \\ \\ \large \sf \:x=-10 \end{array}}$

Resposta:

$\Large\boxed{\sf -10}}$

Cálculos da B)

$\Large\boxed{\begin{array}{lr} \large \sf \:21=3x+24\\ \\ \large \sf \:-3x=24-21 \\ \\ \large \sf \:-3x=3 \\ \\ \large \sf \:x=-\dfrac{3}{3} \\ \\ \large \sf \:x=-1 \end{array}}$

Resposta:

$\Large\boxed{-1}$

Bons estudos =)