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Mathematics 24 Online
OpenStudy (anonymous):

Factor: 7x^2-21x-xy+3y

OpenStudy (akashdeepdeb):

\[7x^2-21x-xy+3y\] Try to find things that you'll get common and can club together. \[7x(x-3)-y(x-3)\] Cool, we could get \((x-3)\) common! \[(7x-y)(x-3)\] Factorized!

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