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-5n+7=-5n-13
We simplify the equation to the form, which is simple to understand
-5n+7=-5n-13
We move all terms containing n to the left and all other terms to the right.
-5n+5n=-13-7
We simplify left and right side of the equation.
n=-20
0=-20
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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