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2x-5y=-19
met przec.wsp
-6x+4y=24
6x-15y=-57
19y=33
y= 33/19
2x- 5*(33/19)--19 i rozw :)
2x-5y=-19/*-3
6x-4y=-24
-6x+15y=57
11y=33
y=3
2x-5*3=-19
2x-15=-19
2x=-19+15
x=-2