Question

como que resolvi isso?

Answer 1

Resposta:

a)

$\frac{3x - 1}{6} = \frac{3}{4} \\ \frac{(3x - 1) \times 4}{6} = 3 \\ \frac{12x - 4}{6} = 3 \\ 12x - 4 = 3 \times 6 \\ 12x - 4 = 18 \\ 12x = 18 - 4 \\ 12x = 14 \\ x = \frac{14}{12} \\ x = \frac{7}{6}$

b)

(x+7)÷21=4÷7

x+7=(4×21)÷7

x+7=4×3

x=12-7

x=5