Question

O CONJUNTO VERDADE DE EQUAÇAO 2X/4 -X/12 = 3 SENDO U=Q e :
a) 36 /5
b) 5/36
c) 3/5
d) 5/3

Answer 1

$\dfrac{2x}{4} - \dfrac{x}{12} = 3 ~~~~~~ MMC = 12 \\ \\ \\ \dfrac{\not12*2x}{\not4} - \dfrac{\not12*x}{\not12} = 3*12 \\ \\ 6x - x = 36 \\ \\ 5x = 36 \\ \\ \boxed{x = \dfrac{36}{5}}$

Alternativa 'A'