Question

A raiz da equação 5x + 40 = 3x+20 é: A) -10 B) +10 C) +5 D) -5

Answer 1

Resposta:

5x-3x=-40+20

2x=-20

x=-20/2

x=-10

Answer 2

$\large\boxed{\begin{array}{l} \rm5x + 40 = 3x + 20 \\ \rm5 x - 3x = 20 - 40 \\ \rm2x = - 20 \\ \rm{x = \dfrac{ - 20}{2} } \\ \\ \rm{x = - 10} \\\huge\boxed{ \boxed{ \boxed{ \boxed{ \rm \dagger \red{ \maltese}~ \blue{alternativa~A}}}}} \end{array}}$