=7/(3x-1)-(5/(2x-1))*((4x^2-1)/(3x-1))=7/(3x-1)-(5/(2x-1))*((2x-1)*(2x+1)/(3x-1))=
=7/(3x-1)-5*(2x+1)/(3x-1)=(7-10x-5)/(3x-1)=(2-10x)/(3x-1)
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=7/(3x-1)-(5/(2x-1))*((4x^2-1)/(3x-1))=7/(3x-1)-(5/(2x-1))*((2x-1)*(2x+1)/(3x-1))=
=7/(3x-1)-5*(2x+1)/(3x-1)=(7-10x-5)/(3x-1)=(2-10x)/(3x-1)