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3f-4-8f=f+4+f
We simplify the equation to the form, which is simple to understand
3f-4-8f=f+4+f
We move all terms containing f to the left and all other terms to the right.
+3f-8f-1f-1f=+4+4
We simplify left and right side of the equation.
-7f=+8
We divide both sides of the equation by -7 to get f.
f=-1.1428571428571
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