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7(1+2h)=21h
We move all terms to the left:
7(1+2h)-(21h)=0
We add all the numbers together, and all the variables
7(2h+1)-21h=0
We add all the numbers together, and all the variables
-21h+7(2h+1)=0
We multiply parentheses
-21h+14h+7=0
We add all the numbers together, and all the variables
-7h+7=0
We move all terms containing h to the left, all other terms to the right
-7h=-7
h=-7/-7
h=1
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