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(f+30)=72
We simplify the equation to the form, which is simple to understand
(f+30)=72
Remove unnecessary parentheses
f+30=72
We move all terms containing f to the left and all other terms to the right.
+1f=+72-30
We simplify left and right side of the equation.
+1f=+42
We divide both sides of the equation by 1 to get f.
f=42
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