Question

Resolva as equações

A) 5 (3x - 2 ) = 2 (6x + 3)

B) 5x - (x - 2) = 2 - 3 (x + 5)

C) 3 ( x + 2 ) +5 = x + 12

Answer 1

A)
5.(3x - 2 ) = 2.(6x + 3)
15x - 10 = 12x + 6
15x - 12x = 6 + 10
3x = 16
x = 16/3
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B)
5x - (x - 2) = 2 - 3.(x + 5) 
5x - x + 2 = 2 - 3x - 15
4x + 2 = - 13 - 3x
4x + 3x = - 13 - 2
7x = - 15
x = - 15/7
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C)
3.( x + 2 ) + 5 = x + 12
3x + 6 + 5 = x + 12
3x + 11 = x + 12
3x - x = 12 - 11
2x = 1
x = 1/2
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Answer 2

a) 15x-10=12x+6
15x-12x=6+10
3x=16
x=16/3
b) 5x-x+2=2-3x-15
5x-x+3x=2-15-2
7x=-15
x=-15/7
c) 3x+6+5=x+12
3x-x=12-6-5
2x=1
x=1/2