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The problem

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6 step unsure of why 15x is now 5(3x-1)

Answer provided by our tutors

THis expression:

was factored.

The common factor was 5. You will see that if you multiply it back, you will get the original expression

5*(3x-1) = 15x-5 -- so these are equivalent expressions.

The expression is factored, so that it could possibly later be reduced with factors in the denominator



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