12+4n = 2n
12+4n-4n = 2n-4n
12 = -2n
-1/2(12 = -2n)
-6 = n
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n= -2
You can't. 17 + 2n = 21 + 2n gives: 2n = 4 + 2n which gives 0=4 which is not possible so the sum is not solveable.
-3n+5n+4 = -4 2n = -4-4 2n = -8 n = -4
2n/3 = 4 2n = 3*4 2n = 12 n = 6 :)
n + 2 = 5, solve for n.n = 5 - 2n = 3