7ху-у+3ху²-9ху-21х+3 = у(7х-1+3ху)-3(3ху+7х-1) = у(3ху+7х-1)-3(3ху+7х-1) = (у-3)(3ху+7х-1)
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7ху-у+3ху²-9ху-21х+3 = у(7х-1+3ху)-3(3ху+7х-1) = у(3ху+7х-1)-3(3ху+7х-1) = (у-3)(3ху+7х-1)