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8-9f=-9f+8
We simplify the equation to the form, which is simple to understand
8-9f=-9f+8
We move all terms containing f to the left and all other terms to the right.
-9f+9f=+8-8
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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