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125=42+h
We move all terms to the left:
125-(42+h)=0
We add all the numbers together, and all the variables
-(h+42)+125=0
We get rid of parentheses
-h-42+125=0
We add all the numbers together, and all the variables
-1h+83=0
We move all terms containing h to the left, all other terms to the right
-h=-83
h=-83/-1
h=+83
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