f-3.9=17.45

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Solution for f-3.9=17.45 equation: 


Simplifying
f + -3.9 = 17.45

Reorder the terms:
-3.9 + f = 17.45

Solving
-3.9 + f = 17.45

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Add '3.9' to each side of the equation.
-3.9 + 3.9 + f = 17.45 + 3.9

Combine like terms: -3.9 + 3.9 = 0.0
0.0 + f = 17.45 + 3.9
f = 17.45 + 3.9

Combine like terms: 17.45 + 3.9 = 21.35
f = 21.35

Simplifying
f = 21.35

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