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-25h+40=-15h-80
We move all terms to the left:
-25h+40-(-15h-80)=0
We get rid of parentheses
-25h+15h+80+40=0
We add all the numbers together, and all the variables
-10h+120=0
We move all terms containing h to the left, all other terms to the right
-10h=-120
h=-120/-10
h=+12
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