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f(-5)=9-5-6
We move all terms to the left:
f(-5)-(9-5-6)=0
We add all the numbers together, and all the variables
f(-5)-(-2)=0
We add all the numbers together, and all the variables
f(-5)+2=0
We multiply parentheses
-5f+2=0
We move all terms containing f to the left, all other terms to the right
-5f=-2
f=-2/-5
f=2/5
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