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b)x - 2xy +½x - ⅓xy= 1,5x - 2⅓xy
c)-x² +y² -2x² - 2y²= - 3x² -y²
d)-x² + 2x - 3x +x²= -x
e) 4x + 4 -7x -½= -3x + 3,5
f) -2ab +12a - 4ab - 16a= -6ab - 4a
b)nie wiem
c)-3x²-3y²
d)-1x
e)-3x+4-½
f)-6ab-4a