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h(-2)=3(-2)-1
We move all terms to the left:
h(-2)-(3(-2)-1)=0
We add all the numbers together, and all the variables
h(-2)+7=0
We multiply parentheses
-2h+7=0
We move all terms containing h to the left, all other terms to the right
-2h=-7
h=-7/-2
h=3+1/2
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