Question

resolver as equações sendo U =Q
A) 3(x+3)-1=2
B) 4-5(x+1)=7
C) -13=7(2x-1)+5
D) 15=4-9(1-2x)
E) 2(x+1)+5(x-1)=7​

Answer 1

$b) \: 4 - 5x - 5 = 7 \\ - 5x = 7 + 1 \\ x = \frac{ - 8}{5}$

$c) \: - 13 = 14x - 7 + 5 \\ 14x = - 13 + 2 \\ 14x = - 11 \\ x = \frac{ - 11}{14}$

$a) \: 3x + 9 - 1 = 2 \\ 3x = 2 - 8 \\ x = \frac{ - 6}{ 3 } \\ x = - 2$

$d) \: 15 = 4 - 9 + 18x \\ 18x = 20 \\ x = \frac{20}{18} \\ x = \frac{10}{9}$

$e) \: 2x + 2 + 5x - 5 = 7 \\ 7x = 10 \\ x = \frac{10}{7}$