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x+2y=6 / * (-2)
2x+3y=10
-2x-4y=-12
teraz zasada przeciwnym wspólczynników i:
2x-2x+3y-4y= 10-12
-y= -2
y=2
gdy y=2, to:
2x+ 3*2= 10 /-6
2x=4
x=2
y=2
;)