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-7-4 (1+3f)=31
We simplify the equation to the form, which is simple to understand
-7-4(1+3f)=31
Reorder the terms in parentheses
-7+(-4-12f)=31
Remove unnecessary parentheses
-7-4-12f=+31
We move all terms containing f to the left and all other terms to the right.
-12f=+31+7+4
We simplify left and right side of the equation.
-12f=+42
We divide both sides of the equation by -12 to get f.
f=-3.5
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