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b.) x-2xy+1/2x-1/3xy=1 1/2x-2 1/3xy
c.) -x²+y²-2x²-2y²= -3x²-y²
d.) -x²+2x-3x+x²= -x
e.) 4x+4-7x-1/2= -3x+3 1/2
f.) -2ab+12a-4ab-16a= -6ab-4a
b) 1 i 1/2x - 2 i 1/3xy
c) -3x(do kwadratu) - y(do kwadratu)
d) -x
e) -3x + 3 i 1/2
f) -6ab - 4a