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340=40h+220
We move all terms to the left:
340-(40h+220)=0
We get rid of parentheses
-40h-220+340=0
We add all the numbers together, and all the variables
-40h+120=0
We move all terms containing h to the left, all other terms to the right
-40h=-120
h=-120/-40
h=+3
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