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180=3h+18+15h
We move all terms to the left:
180-(3h+18+15h)=0
We add all the numbers together, and all the variables
-(18h+18)+180=0
We get rid of parentheses
-18h-18+180=0
We add all the numbers together, and all the variables
-18h+162=0
We move all terms containing h to the left, all other terms to the right
-18h=-162
h=-162/-18
h=+9
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