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-31=15+-2h
We move all terms to the left:
-31-(15+-2h)=0
We add all the numbers together, and all the variables
-(-2h)-31=0
We get rid of parentheses
2h-31=0
We move all terms containing h to the left, all other terms to the right
2h=31
h=31/2
h=15+1/2
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