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10f+15=10f-2
We simplify the equation to the form, which is simple to understand
10f+15=10f-2
We move all terms containing f to the left and all other terms to the right.
+10f-10f=-2-15
We simplify left and right side of the equation.
f=-17
0=-17
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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