5n + 1 = 10 + 2n
5n - 2n + 1 - 1 = 10 - 1 + 2n - 2n
3n = 9
3n/3 = 9/3
n = 3
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5n + 15 = 25 you subtract 15 from both sides then you get 10 then divided 5n by 10 you get 2n
9 - 5n
-3n+5n+4 = -4 2n = -4-4 2n = -8 n = -4
n=1 2/3
3n + 2n = 25 5n = 25 n = 5