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12f-15=12f-5
We simplify the equation to the form, which is simple to understand
12f-15=12f-5
We move all terms containing f to the left and all other terms to the right.
+12f-12f=-5+15
We simplify left and right side of the equation.
f=+10
0=10
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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