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b).(a² -2)(5a+b)=5a³+a²b-10a-2b
c). 2-(6x-7)(3x² -2)=2-18x³-12x-21x²-14=-18x³-21x²-12x-12
d)/ 3(2-x)-(5-x)=(6-2x)-(5-x)=6-3x-5+x=11-2x
e.) -2(5-8x)=-10+16x