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-12-4f=-5f
We simplify the equation to the form, which is simple to understand
-12-4f=-5f
We move all terms containing f to the left and all other terms to the right.
-4f+5f=+12
We simplify left and right side of the equation.
+1f=+12
We divide both sides of the equation by 1 to get f.
f=12
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