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6f+4=6f-12
We simplify the equation to the form, which is simple to understand
6f+4=6f-12
We move all terms containing f to the left and all other terms to the right.
+6f-6f=-12-4
We simplify left and right side of the equation.
f=-16
0=-16
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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