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-f/4+20.5=12.9
We simplify the equation to the form, which is simple to understand
-f/4+20.5=12.9
Simplifying:
-0.25f+20.5=12.9
We move all terms containing f to the left and all other terms to the right.
-0.25f=+12.9-20.5
We simplify left and right side of the equation.
-0.25f=-7.6
We divide both sides of the equation by -0.25 to get f.
f=30.4
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