Question

5) O numero 5 é raiz da equação 7x- 6 = 5x+4 *

( )Certo
( )Errado
???

Answer 1

Resposta:

(x)Certo

Explicação passo a passo:

$7x- 6 = 5x+4\\\\\mathrm{Adicionar\:}6\mathrm{\:a\:ambos\:os\:lados}\\\\7x-6+6=5x+4+6\\\\\mathrm{Simplificar}\\\\7x=5x+10\\\\\mathrm{Subtrair\:}5x\mathrm{\:de\:ambos\:os\:lados}\\\\7x-5x=5x+10-5x\\\\\mathrm{Simplificar}\\\\2x=10\\\\\mathrm{Dividir\:ambos\:os\:lados\:por\:}2\\\\\frac{2x}{2}=\frac{10}{2}\\\\\mathrm{Simplificar}\\\\x=5$