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13=1+3h
We move all terms to the left:
13-(1+3h)=0
We add all the numbers together, and all the variables
-(3h+1)+13=0
We get rid of parentheses
-3h-1+13=0
We add all the numbers together, and all the variables
-3h+12=0
We move all terms containing h to the left, all other terms to the right
-3h=-12
h=-12/-3
h=+4
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