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y - lata babci
x+y=126
y=126-x
x=2[y-(x-y)]
x=2(y-x+y)
x=2(2y-x)
x=4y-2x
x=4(126-x)-2x
x=504-4x-2x
x=504-6x
7x=504
x=504/7
x=72
Odp:dziadek ma 72 lata.