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Mathematics, 10.03.2021 22:00 johnandashley5p65r4a

An electrician charges $50 to come to my house plus $75 per hour. When he was finished, my bill was $350. How long was the electrician at my house? PLEASE HELP!!

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An electrician charges $50 to come to my house plus $75 per hour. When he was finished, my bill was...
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