Question

resolva as seguintes questões

a) 9-3x = 13-x
b) 2x + 3 = 13
c) 2x +6 = -3 - x
d) 2x+3 = x+5

Answer 1

a)
$9 - 3x = 13 - x \\ - 3x + x = 13 - 9 \\ - 2x = 4( - 1) \\ 2x = - 4 \\ x = \frac{ - 4}{2} \\ x = - 2$

b)
$2x + 3 = 13 \\ 2x = 13 - 3 \\ 2x = 10 \\ x = \frac{10}{2} \\ x = 5$

c)
$2x + 6 = - 3 - x \\ 2x + x = - 3 - 6 \\ 3x = - 9$
x=-9/3
×=-3

d)
$2x + 3 = x + 5 \\ 2x - x = 5 - 3 \\ x = 2$