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f(-2)=5^2-7(-1)+1
We move all terms to the left:
f(-2)-(5^2-7(-1)+1)=0
We add all the numbers together, and all the variables
f(-2)-33=0
We multiply parentheses
-2f-33=0
We move all terms containing f to the left, all other terms to the right
-2f=33
f=33/-2
f=-16+1/2
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