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f(5.10)=55
We move all terms to the left:
f(5.10)-(55)=0
We add all the numbers together, and all the variables
f(5.1)-55=0
We multiply parentheses
5.1f-55=0
We move all terms containing f to the left, all other terms to the right
5.1f=55
f=55/5.1
f=10+4/5.1
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