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x+y=15
7x-3y=55
hacemos reduccion:
3(x+y=15)....................3x+3y=45
7x-3y=55.....................7x-3y=55
10x=100...........x=100/10............x=10
si x=10
x+y=15
10+y=15
y=15-10
y=5
gano 10 partidas y perdio 5 partidas