Question

Resolva:
a)2x + 6 = x + 18
b)5x - 3 = 2x + 9
c)3 (2x - 3 ) + 2 (x + 1 ) = 3x + 18
d)2x + 3 (x - 5) = 4x + 9
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Answer 1

a) 2x + 6 = x + 18
2x - x = 18 - 6
x = 12

b) 5x - 3 = 2x + 9
5x - 2x = 9 + 3
3x = 12
x = 12/3
x = 4

c) 3 (2x - 3) + 2(x + 1) = 3x + 18
6x - 9 + 2x + 2 = 3x + 18
6x + 2x - 3x = 18 + 9 - 2
5x = 25
x = 5

d) 2x + 3(x - 5) = 4x + 9
2x + 3x - 15 = 4x + 9
2x + 3x - 4x = 9 + 15
x = 24