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8-5f+2f+7=0
We simplify the equation to the form, which is simple to understand
8-5f+2f+7=0
We move all terms containing f to the left and all other terms to the right.
-5f+2f=0-8-7
We simplify left and right side of the equation.
-3f=-15
We divide both sides of the equation by -3 to get f.
f=5
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