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f(-14)=8(-14)+15
We move all terms to the left:
f(-14)-(8(-14)+15)=0
We add all the numbers together, and all the variables
f(-14)+97=0
We multiply parentheses
-14f+97=0
We move all terms containing f to the left, all other terms to the right
-14f=-97
f=-97/-14
f=6+13/14
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