Zapisz w najprostszej postaci : a)3x+7y-8x-9y
b)4(-3x-4)
9y+3
c)-------
3
d)-3y(3y+ jedna trzecia)+10y
a -5x-2y
b -12x+9x-13
d -9ykwadrat+9y
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a -5x-2y
b -12x+9x-13
d -9ykwadrat+9y