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-6x+7y = -45
6x - 10y = 54
-6x +7y = -45
------------------- +
-3y = 9 /:(-3)
y= -3
3x-5*(-3)=27
3x+15=27
3x=27-15
3x=12 /:3
x=4
Odp. x=4, y=-3.