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8=f(5)-7
We simplify the equation to the form, which is simple to understand
8=f(5)-7
Reorder the terms in parentheses
8=+(+5f)-7
Remove unnecessary parentheses
+8=+5f-7
We move all terms containing f to the left and all other terms to the right.
-5f=-7-8
We simplify left and right side of the equation.
-5f=-15
We divide both sides of the equation by -05 to get f.
f=3
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