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123=45+12h
We move all terms to the left:
123-(45+12h)=0
We add all the numbers together, and all the variables
-(12h+45)+123=0
We get rid of parentheses
-12h-45+123=0
We add all the numbers together, and all the variables
-12h+78=0
We move all terms containing h to the left, all other terms to the right
-12h=-78
h=-78/-12
h=6+1/2
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