Question

1) Resolva as equações:
a) – 5 (- x - 4) = - 5
b) 2x – 3 = 7 – 2 (2x - 13)
c) – (x – 2) – 2 = 2 (x - 5) + 4x
d) 6 (x - 3) – 9 (x - 1) = 5 – (x + 3)
e) – 2 (2x + 1) – 3 (x - 5) = - 8
f) 3 (6x - 8)+ 10 = 5 (x - 2) – (- 4 + 3x)

Answer 1

a) -5 (-x -4) =-5
+5x +20 =-5
5x = -5 -20
5x = -25
x=
$\frac{25}{5}$
x=5

b)2x -3=7-2 (2x -13)
2x-3=7-4x+29
2x +4x = +7 +29 +3
6x=39
x=
$\frac{39}{6}$

c)-(x-2)-2=2(x-5)+4x
-x+2-2=2x-10+4x
-x -2x -4x = -10-2+2
-7x= -10 .(-1)
+7x=+10
x=
$\frac{10}{7}$