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a)2y^3-2y^2-2y-4-2y^3+4y^2+4y=2y^2-2y-4
b)x^3-3x^2-x-2x^2+6x+2=-5x^2+x^3+5x+2
c)6a^a+8ab-3ab-4b^2-2(ab-2a^2+3b^2-6ab)=6a^a+8ab-3ab-4b^2-2ab+4a^2-6b^2+12ab=10a^2+17ab-10b^2
7.
a)3x-4y+4x-6y=7x-10y=21+16=37
b)(0,5-3)(-2+4+8)=-1,5*10=-15
8.
a)4(ab+3a)
b)3(5xy^2-6x^2y)
10.
(2*5x)/2=10x/2=5x