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-2(2a+1)(4-3a)=-2(8a-6a²+4-3a)=12a²-10a-8
-3(1/3+5/6 b)(2b-6)=(-1-5/2 b)(2b-6)=-2b+6-5b²+15b=-5b²+13b+6
8(3/2-7/4 y)(y-7)=(12-14y)(y-7)=12y-84-14y²+98y=-14y²+110y-84