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-(-5)+2*(-4)-3= 5+(-8)-3= 5-8-3= -6
b) 4x
------- <ułamek> dla x = 6 i y = -2
y (x+y)
4*6 : -2 [6 + (-2)]=24: -2* 4= 24: (-8)=-3
a) (a+2) dla a = 7 i h = 1/3 (jedna trzecia)
(7+2)= 9 nie wiem o co chodzi z literą h