Answer
$y^6(3x-1)^4(6xy-2y-7)$.
Work Step by Step
The given expression is
$=2y^7(3x-1)^5-7y^6(3x-1)^4$
Factor out the common factor $y^6(3x-1)^4$ from both terms.
$=y^6(3x-1)^4[2y(3x-1)-7]$
Simplify.
$=y^6(3x-1)^4(6xy-2y-7)$.
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