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-90=-3(5h-5)
We move all terms to the left:
-90-(-3(5h-5))=0
We calculate terms in parentheses: -(-3(5h-5)), so:We get rid of parentheses
-3(5h-5)
We multiply parentheses
-15h+15
Back to the equation:
-(-15h+15)
15h-15-90=0
We add all the numbers together, and all the variables
15h-105=0
We move all terms containing h to the left, all other terms to the right
15h=105
h=105/15
h=7
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