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a) 2x - 5 dla x= -3
2*(-3)-5=-6-5= -11
b) -6 - 2y dla y = -2
-6-2*(-2)=-6+4=-2
c) 2x +3y - 5 dla x= 3 i y= -4
2*3+3*(-4)-5=6-12-5=6-17=-11