Question

Resolva as equações abaixo:

a) 4x-7 = 8x-12
b) 2x+1=4x-7
c) 9x+9-3x=15
d) 5x+6x-16=3x+2x-4


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Answer 1

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a)

4x - 7= 8x - 12

4x - 8x= - 12 + 7

- 4x= 5>>.(-1)

4x= - 5

x= - 5/4

______________

b)

2x + 1= 4x - 7

2x - 4x= - 7 - 1

- 2x= - 8>>.(-1)

2x= 8

x= 8/2

x= 4

______________

c)

9x + 9 - 3x= 15

9x - 3x= 15 - 9

6x= 6

x= 6/6

x= 1

______________

d)

5x + 6x - 16= 3x + 2x - 4

5x + 6x - 3x - 2x= - 4 + 16

6x= 12

x= 12/6

x= 2