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91=-7(3h-1)
We move all terms to the left:
91-(-7(3h-1))=0
We calculate terms in parentheses: -(-7(3h-1)), so:We get rid of parentheses
-7(3h-1)
We multiply parentheses
-21h+7
Back to the equation:
-(-21h+7)
21h-7+91=0
We add all the numbers together, and all the variables
21h+84=0
We move all terms containing h to the left, all other terms to the right
21h=-84
h=-84/21
h=-4
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