Rozwiąż układy równań.
3(x-y)+2(x+y)=7
2x-3y=-5
4(x-y)+3(x+y)=13
2x-3y=1
3x-3y+2x+2y=7
5x-y=7
y=-7+5x
2x-3(7+5x)=-5
2x+21-15x=-5
-13x=-26 /-13
x=2
y=-7+5*2
y=3
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