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4f+12+5=17+4f
We simplify the equation to the form, which is simple to understand
4f+12+5=17+4f
We move all terms containing f to the left and all other terms to the right.
+4f-4f=+17-12-5
We simplify left and right side of the equation.
f=0
0=0
This equation is an identity, so all real numbers are solutions.
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