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40=10h+4+2h
We move all terms to the left:
40-(10h+4+2h)=0
We add all the numbers together, and all the variables
-(12h+4)+40=0
We get rid of parentheses
-12h-4+40=0
We add all the numbers together, and all the variables
-12h+36=0
We move all terms containing h to the left, all other terms to the right
-12h=-36
h=-36/-12
h=+3
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