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-3n+21-5n=-15-8n
We simplify the equation to the form, which is simple to understand
-3n+21-5n=-15-8n
We move all terms containing n to the left and all other terms to the right.
-3n-5n+8n=-15-21
We simplify left and right side of the equation.
n=-36
0=-36
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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