(12abc-3bc^2)÷(4a-c)=3bc(4a-c)÷(4a-c)=3bc[m(a-3)+2(3-a)]÷(a-3)=[m(a-3)-2(a-3)]÷(a-3)=(m-2)(a-3)÷(a-3)=m-2(12x^2-3y^2)÷(2x-y)=3(4x^2-y^2)÷(2x-y)=3(2x+y)(2x-y)÷(2x-y)=3(2x+y)=6x+3y(y^2+y+1/4)÷(...