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f(-4)=-5-4
We move all terms to the left:
f(-4)-(-5-4)=0
We add all the numbers together, and all the variables
f(-4)-(-9)=0
We add all the numbers together, and all the variables
f(-4)+9=0
We multiply parentheses
-4f+9=0
We move all terms containing f to the left, all other terms to the right
-4f=-9
f=-9/-4
f=2+1/4
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