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2014-08-27T19:58:18-03:00
100-20=15x-10x
80=5x
80/5=x
x=16
2 5 2
2014-08-27T19:59:28-03:00
10x + 100= 15x + 20
10x - 15x = 100 + 20
-5x = 120
x = 120/5
x = 24