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h(-3)=-2(-3)^2+4(-3)-10
We move all terms to the left:
h(-3)-(-2(-3)^2+4(-3)-10)=0
We add all the numbers together, and all the variables
h(-3)+40=0
We multiply parentheses
-3h+40=0
We move all terms containing h to the left, all other terms to the right
-3h=-40
h=-40/-3
h=13+1/3
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