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h(-2)=-4(-2)-4
We move all terms to the left:
h(-2)-(-4(-2)-4)=0
We add all the numbers together, and all the variables
h(-2)-4=0
We multiply parentheses
-2h-4=0
We move all terms containing h to the left, all other terms to the right
-2h=4
h=4/-2
h=-2
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