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7(6-h)=-21
We move all terms to the left:
7(6-h)-(-21)=0
We add all the numbers together, and all the variables
7(-1h+6)-(-21)=0
We add all the numbers together, and all the variables
7(-1h+6)+21=0
We multiply parentheses
-7h+42+21=0
We add all the numbers together, and all the variables
-7h+63=0
We move all terms containing h to the left, all other terms to the right
-7h=-63
h=-63/-7
h=+9
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