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factor a 2 from (2x-6) and a 5 from (5x-15)
multiply the outsides . multiply the insides. place back in outsides / insides
this step takes the place of writing the problem horizontially, finding the reciprocal of the second fraction and then multiplying.
next, reduce the fractions by canceling the (x-3)
reduce the 12 and 21 by dividing both by 3
multiply