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4a-b=96
dalej juz powinienes umiec rozwiazac
4x-x=96
3x=96
x=96:3
x=32
4x=128
128-32=96
4x=y
y-4y=96
x=4y
3y= 96
x=4y
y=32
x=4*32
x=32
y=128