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2014-04-23T18:03:42-03:00
X-20+x+50=180
x+x=180-30
2x=150
x=150/2
x=75


1 5 1
2014-04-23T18:05:45-03:00
X - 20 + x + 50 = 180
2x + 30 = 180
2x = 150
x = 75.
1 1 1