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y-wiek babci
x+y=105
x=2(y-(x-y))
x=105-y
x=2(2y-X)
x=105-y
3x=4y
x=105-y
3(105-y)=4y
x=105-y
315-3y=4y
x=105-x
-3y-4y=-315/:-7
x=105-45
y=45
x=60
y=45