Question

Resolva as equações:

a) 15X + 45 = 30
b) 10x - (2x + 44) = -8
c) 18X - 43 = 65
d) 23X - 16 = 14 - 17X
e) -5X + 45 -89 = -90 + 41

Answer 1

a)
15x + 45 = 30
15x = 30 - 45
15x = - 15
x =  - 15/15
x = - 1

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b)
10x - (2x + 44) = -8
10x - 2x - 44 = - 8
8x - 44 = - 8
8x = - 8 +44
8x = 36
x =   36 (:4)
       -------
          8  (:4)

x = 9/2

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c)
18x - 43 = 65
18x = 65 + 43
18x = 108
x = 108/18
x = 6

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d)
23x - 16 = 14 - 17x
23x + 17x = 14 + 16
40x = 30
x = 3/4

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e)
-5x + 45 -89 = - 90 + 41
- 5x - 44 = - 49
- 44 + 49 = 5x
5 = 5x
5x = 5
x = 5/5
x = 1

Answer 2

a) 15X + 45 = 30
15x= 30-45
15x= -15
x= -15/15
x= -1

b) 10x - (2x + 44) = -8
10x-2x-44= -8
10x-2x= -8+44
8x= 36
x= 36/8
x= 9/2

c) 18X - 43 = 65
18x= 65+43
18x= 108
x=108/18
x=6

d) 23X - 16 = 14 - 17X
23x+17x= 14+16
40x= 30
x= 30/40

e) -5X + 45 -89 = -90 + 41
-5x= -90 + 41 -45+89
-5x= -5
x= -5/ -5
x= 1