Question

Questões
Resolva as equações:
a) 3x + 4 (1 + x) + 2= 5x –x - 6
b) 2x/3 – x/5 = 6(x – 2)

Answer 1

a)

3x + 4 (1 + x) + 2 = 5x - x - 6
3x + 4 + 4x + 2 = 4x - 6
7x + 6 = 4x - 6
7x - 4x = - 6 - 6
3x = - 12
x = -12/3
x = - 4

b)

2x - x = 6(x - 2)
 3    5

2x - x  = 6x - 12
3     5
mmc de 3,5 = 15

5.2x - 3.x = 15. (6x - 12)
    15               15

10x - 3x = 90x - 180
7x = 90x - 180
180 = 90x - 7x
180 = 83x
83x = 180

x = 180
       83
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