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-4(a-b)= -4a+4b
7(5-c)=35-7c
-x(5y+x)= -5xy-x²
-2x(-2x-3+y)=4x²+6x-2xy
(2x+6) : 2=x+3
(4x-8) : (-2)= -2x+4
b) -4(a - b)=-4a+4b
c) 7(5 - c)=35-7c
d) -x(5y + x)=-5xy-x(do kwadratu)
e) -2x(-2x - 3 + y)=4x(do kwadratu)+6x-2xy
f) (2x + 6) :2 =x+3
g) (4x-8):(-2)=-2x+4