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-5x-4y=-1
5x+5y=5
-5x-4y=-1 dodajemy stronami
y=4
x=1-4
x=-3
f) 1/2x+1/3y=-5/*6
x+y=-12/*(-3)
3x+2y=-30
-3x-3y=36 dodajemy stronami
-y=6
y=-6
x=-12+6
x=-6