21=7+4f

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Solution for 21=7+4f equation:


21=7+4f

We simplify the equation to the form, which is simple to understand 
21=7+4f

We move all terms containing f to the left and all other terms to the right. 
-4f=+7-21

We simplify left and right side of the equation. 
-4f=-14

We divide both sides of the equation by -04 to get f. 
f=3.5

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