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y-wiek babci
x+y=105
x=2(y-(x-y))
x+y=105
x=4y-2x
x+y=105 /*4
3x-4y=0
4x+4y=420
3x-4y=0
7x=420
x=60
x+y=105
x=60
y=105-60
x=60
y=45
x=60