Math
posted by Raymond .
Higgins Rental charges $ 18 an hour to rent a power tool in addition to a $9 flat service fee. If Joseph rents a power tool and is charged $ 423, how many hours did he rent the tool?
Hint: Convert the above scenario into an equation of the form A x + B = C.
I need help to get to the right direction of this problem to get the right answer
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