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x+y=29
x+x+5=29
2x=24
x=12
y=12+5=17
12*17=204
y druga licza
x+y=29
5+x=y
x+y=29
x-y=-5
2x=24
x=12
12+y=29
29-12=y
x=12
y=17
12*17= 204