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2x+5y=-26/*5
10x-6y=-6
10x+25y=-130
10x=6y-6
6y-6+25y=-130
10x=6y-6
31y=-124
10x=6y-6
y=-4
10x=-24-6
y=-4
10x=-30
y=-4
x=-3
y=-4
2x+5y=-26/*5
10x-6y=-6
10x+25y=-130
10x=6y-6
6y-6+25y=-130
10x=6y-6
31y=-124
10x=6y-6
y=-4
10x=-24-6
y=-4
10x=-30
y=-4
x=-3
y=-4
spr.
5*(-3)-3*(-4)=-3
-15+12=-3
2*(-3)+5*(-4)=-26
-6-20=-26
;)