21=3(f-89)

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Solution for 21=3(f-89) equation:


21=3(f-89)

We simplify the equation to the form, which is simple to understand 
21=3(f-89)

Reorder the terms in parentheses
21=+(+3f-267)

Remove unnecessary parentheses
+21=+3f-267

We move all terms containing f to the left and all other terms to the right. 
-3f=-267-21

We simplify left and right side of the equation. 
-3f=-288

We divide both sides of the equation by -03 to get f. 
f=96

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