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h(-1)=-2(-1)-4
We move all terms to the left:
h(-1)-(-2(-1)-4)=0
We add all the numbers together, and all the variables
h(-1)+2=0
We multiply parentheses
-1h+2=0
We move all terms containing h to the left, all other terms to the right
-h=-2
h=-2/-1
h=+2
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