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13 - 9h - 15 = 7h + 22 - 8h
..
Group like terms, balance what you do on what side with the other side
13 - 9h - 15 - 13 + 15 = 7h + 22 - 8h - 7h - 13 + 15 + 8h
yields
-9h - 7h + 8h = 22 - 13 + 15
Combine like terms
-8h = 24
Divide both sides by -8
h = -3
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