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f(-3)=-3.5
We move all terms to the left:
f(-3)-(-3.5)=0
We add all the numbers together, and all the variables
f(-3)+3.5=0
We multiply parentheses
-3f+3.5=0
We move all terms containing f to the left, all other terms to the right
-3f=-3.5
f=-3.5/-3
f=1+0.5/3
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