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-9f=64-f
We simplify the equation to the form, which is simple to understand
-9f=64-f
We move all terms containing f to the left and all other terms to the right.
-9f+1f=+64
We simplify left and right side of the equation.
-8f=+64
We divide both sides of the equation by -8 to get f.
f=-8
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