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-2x-4y=-12
-3y=-12
y=4
y=4
x+2*4=6
y=4
x+8=6
y=4
x=-2
_________________________ metodą podstawiania na zycznie
y+2x=0
x+2y=6
y=-2x
x+2(-2x)=6
y=-2x
-3x=6
y=-2x
x=-2
y=4
x=-2