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1/5x+1/4y=2-2,5 /*20
-4x-0,2y=-38
4x+5y=-10
------------ +
4,8y=-48 /:(4,8)
y=-10
2x+0,1*(-10)=19
2x-1=19
2x=19+1 /:2
x=10
Odp. x=10, y=-10.