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h+(h-30)=5h-15
We move all terms to the left:
h+(h-30)-(5h-15)=0
We get rid of parentheses
h+h-5h-30+15=0
We add all the numbers together, and all the variables
-3h-15=0
We move all terms containing h to the left, all other terms to the right
-3h=15
h=15/-3
h=-5
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