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Mathematics, 06.03.2020 22:35 FlyingPig14

The equation 9+12m=6+15(m-1) models the following situation: Movie-rental company A charges a sign-
up fee of $9 plus $12 per month, and company B charges $6 for the first month plus $15 per month after
that. At a certain number of months, the cost of the two companies is equal.
Which equation is a simplified version of the one above?

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