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x+2y=3 i x+2y=1,5
x+2y=3 i 0,5x+y=1,5
x+y=3 i x+2y=1,5
x+y=3 i 0,5x+y=1,5
b) nie ma
c) x+2y=3 i 0,5x+y=1,5