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-3.5h=-12.5
We move all terms to the left:
-3.5h-(-12.5)=0
We add all the numbers together, and all the variables
-3.5h+12.5=0
We move all terms containing h to the left, all other terms to the right
-3.5h=-12.5
h=-12.5/-3.5
h=3+2/3.5
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