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-3f-1=8-3f
We simplify the equation to the form, which is simple to understand
-3f-1=8-3f
We move all terms containing f to the left and all other terms to the right.
-3f+3f=+8+1
We simplify left and right side of the equation.
f=+9
0=9
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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