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f(-3.4)=-4
We move all terms to the left:
f(-3.4)-(-4)=0
We add all the numbers together, and all the variables
f(-3.4)+4=0
We multiply parentheses
-3.4f+4=0
We move all terms containing f to the left, all other terms to the right
-3.4f=-4
f=-4/-3.4
f=1+0.6/3.4
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