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n
5n+8n-12n
13n-12n = n
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5n - 4 = 10n + 6-5n = 10n = -2
5n+4=0 5n=-4 n= -4/5
6m + 5n - 4m + 7n = 2m + 12n
5n+15 = 25 5n = 25-15 5n = 10 n = 2
-5n+9=-46 -5n+9-9=-46-9 -5n=-55 -5n/-5=-55/-5 n=11