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2.3x + 2.1/4 = 5.2x + 5.(-1/6)
6x + 1/2 = 10x - 5/6 ----> kdua ruas dikali dg 6, menjadi:
36x + 3 = 60x - 5
36x - 60x = -5 - 3
- 24x = -8
x = 8/24
x = 1/3
2) 2x + 60 + x = 180
3x + 60 = 180
3x = 180 - 60
3x = 120
x = 120/3
x = 40
3) y-1/3 = 3(y-3)/7
y-1/3 = 3y-9 / 7-----> kdua ruas dikali dg 21 menjadi:
7(y-1) = 3(3y-9)
7y-7 = 9y-27
7y-9y = -27+7
-2y = -20
y = 20/2
y = 10