f(3.9)=5.1+0.8*3.9

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Solution for f(3.9)=5.1+0.8*3.9 equation: 



f(3.9)=5.1+0.8*3.9

We move all terms to the left:

f(3.9)-(5.1+0.8*3.9)=0

We add all the numbers together, and all the variables

f(3.9)-(8.22)=0

We add all the numbers together, and all the variables

f(3.9)-8.22=0

We multiply parentheses

3.9f-8.22=0

We move all terms containing f to the left, all other terms to the right

3.9f=8.22

f=8.22/3.9

f=2+0.42/3.9

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