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edad novia y
x+y = 62.........................1
3(x-10)÷4= (y - 10)........2
en ecu. 2
3x-30=4y-40
4y-3x=10
reduccion
3x + 3y = 62 ..../×3
-3x + 4y = 10
7y = 196
y = 28 x=34