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there can be more then one way to solve this...but I would start by adding 21 to both sides 9h - 21 = 99 9h - 21 + 21 = 99 + 21 9h = 99 + 21 9h = 120 h = 120/9 h = 13.33 or 13 1/3
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there can be more then one way to solve this...but I would start by adding 21 to both sides 9h - 21 = 99 9h - 21 + 21 = 99 + 21 9h = 99 + 21 9h = 120 h = 120/9 h = 13.33 or 13 1/3