Question

2
Sabendo que U = Z, resolva as equações.
a) - 40 = -10x
b) 3x = -45 - 2x
c) 6(x + 3) - 2x - 5) = 20
d) - 18 = 2x + 15
e) 2(x - 1) - 1 = 8
f) 24x - 7) - 4(5 - x) = 2
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Answer 1

Explicação passo-a-passo:

a)-40 = -10 x

10x=40

x=40/10

x=4

b)3x=-45-2x

3x+2x=45

5x=45

x=45/5

x=9

c)6(x+3)-2x-5)=20

6x+18-12x-30=20

6x+12x=20-18+30

18x=2+30

18x=32

x=32/18

x=1,7

d)-18=2x+15

2x=15+18

2x=33

x=33/2

x=16,5

e)2(x-1)-1=8

2x-2-1=8

2x=8+2+1

2x=11

x=11/2

x=5,5

f)24(x-7)-4(5-x)=2

24x-168-20-4x=2

24x-4x=2+168+20

20x=190

x=190/20

x=9,5