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b) -x + 2y -3 dla x=-5 i y =-4 = 5+2*(-4)-3 = 5-8-3 = -6
(7+2)*⅓=9*⅓=3
b)-x + 2y-3
5+2*(-4)-3=5-8-3=-6
b) 5+2*(-4)-3 = 5-8-3 = -6