2n + 1 = n
subtract n from both sides
n + 1 = 0
subtract 1 from both sides
n = - 1
========check in original equation
2(- 1) + 1 = - 1
- 2 + 1 = - 1
- 1 = - 1
=======checks
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n = 1
5n + 1 = 10 + 2n5n - 2n + 1 - 1 = 10 - 1 + 2n - 2n3n = 93n/3 = 9/3n = 3
2(10)+1
12+4n = 2n12+4n-4n = 2n-4n12 = -2n-1/2(12 = -2n)-6 = n
n=1 2/3