Question

Sabendo que U=Z resolva as equações
A) -40=-10x
B) 3x=-45-2x
C) 6(x+3)-2(x-5)=20
D) -18=2x+15
E) 2(x-1)-1=8
F) 2 (×-7)-4(5-x)=2

Answer 1

a) -40 = -10x
10x = 40
x = $\frac{40}{10}$
x = 4

b) 3x = -45 - 2x
3x + 2x = -45
5x = -45
x = $\frac{-45}{5}$
x = -9

c) 6 * (x+3) - 2 * (x-5) = 20
6x + 18 - 2x + 10 = 20
6x - 2x = 20 - 18 - 10
4x = -8
x = $\frac{-8}{4}$
x = -2

d) -18 = 2x + 15
2x + 15 = -18
2x = -18 - 15
2x = 33
x = $\frac{-33}{2}$
x = -16,5

e) 2 * (x-1) - 1 = 8
2x - 2 - 1 = 8
2x = 8 + 2 + 1
2x = 11
x = $\frac{11}{2}$
x = 5,5

f) 2 * (x - 7) - 4 * (5 - x) = 2
2x - 14 - 20 + x = 2
2x + x = 2 + 14 + 20
3x = 36
x = $\frac{36}{3}$
x = 12

Espero ter lhe ajudado =)

Answer 2

a) x=4
b) 3x + 2x = -45 --> x = - 9
c) 6x + 18 - 2x + 10 = 20 --> 4x = - 8 --> x = - 2
d) -18 - 15 = 2x --> -33 = 2x --> x = -33/2
e) 2x - 2 - 1 = 8 --> 2x = 11 --> x = 11/2
f) 2x - 14 - 20 + x = 2 --> 3x = 36 --> x = 12