Question 232285
a plumber charges $30 per hour and $42 for each hour of overtime. 
For a job, the plumber works 3 regular hours, h over time hours, and charges $195 for new parts. The total amount of the bill for the job is $390. Write an solve an equation to find the number of overtime hours the plumber worked. 
What i really need help on is how to write an equation for it. please help.
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390 = 30*3 + 42h + 195 
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Cheers,
Stan H.