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2(x+2) = 30 - 3x
2x + 4 = 30 - 3x
2x + 3x = 30 - 4
5x = 26
x = 26/5
x = 5,2
5) 2/(x+1) - 1/x = 4/x kalikan semua ruas dg x(x+1)
2x - (x+1) = 4(x+1)
2x - x - 1 = 4x + 4
x - 4x = 4 + 1
-3x = 5
x = -5/3
x = - 1,67
6) (x-2)/7 - (3+5x)/2 = (2x-1)/4 kalikan semua ruas dg 28
4(x-2) - 14(3+5x) = 7(2x-1)
4x - 8 - 42 - 70x = 14x - 7
- 66x - 14x = -7 + 8 + 42
- 80x = 43
x = -43/80
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