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A+B+C=180............2
2B-40= C................3
SUMANDO 1 y 2
A+2B+2C-100= 180+A
B+C=140
TENEMOS QUE A=40
SUMANDO 1 Y 3
3B+C-140= A+C........ A=40
3B=180
TENEMOS QUE
B=60
C=80