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f(-2)=5(-2)-3
We move all terms to the left:
f(-2)-(5(-2)-3)=0
We add all the numbers together, and all the variables
f(-2)+13=0
We multiply parentheses
-2f+13=0
We move all terms containing f to the left, all other terms to the right
-2f=-13
f=-13/-2
f=6+1/2
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