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3(f-4)=-21
We simplify the equation to the form, which is simple to understand
3(f-4)=-21
Reorder the terms in parentheses
+(+3f-12)=-21
Remove unnecessary parentheses
+3f-12=-21
We move all terms containing f to the left and all other terms to the right.
+3f=-21+12
We simplify left and right side of the equation.
+3f=-9
We divide both sides of the equation by 3 to get f.
f=-3
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