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2014-09-09T17:45:37+03:00
A+B+C=180
A=2B⇒B= \frac{A}{2}
C=3A
A+ \frac{A}{2} +3A=180
2A+ \frac{A}{2} +3A=180*2
9A=180*2
A=40
B=20
C=120

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