Question

resolva as equaçoes :A) 3 x + 2 sobe 2 =7 B)7 x + 5 sobe 2 = 27 C) 3 x + 2 x + 1 = 6 D) 7 x + 5 x =6

Answer 1

a)
$3x + \frac{2}{2} = 7 \\ 3x + 1 = 7 \\ 3x = 7 - 1 \\ 3x = 6\\x = \frac{6}{3} \\ x = 2$
b)
$7x + \frac{5}{2} = 27 \\ \frac{14x + 5}{2} = \frac{54}{2} \\ 14x + 5 = 54 \\ 14x = 54 - 5 \\ 14x = 49 \\ x = \frac{49}{14} \\ x = 3.5$
c)
$3x + 2x + 1 = 6 \\ 5x = 6 - 1 \\ 5x = 5 \\ x = \frac{5}{5} \\ x = 1$