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4+3x-3=15+9x
3x-9x=15-4+3
-6x=14/*(-1)
6x=14/:6
x=2 i 1/3
8x-4y=14
4x-3y=7/*(-2)
8x-4y=14
-8x+6y=-14
dodajemy stronami
2y=0
y=0
8x-4y=14
8x-0=14
8x=14/:8
x=1 i 3/4
y=0