n= -2
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12+4n = 2n12+4n-4n = 2n-4n12 = -2n-1/2(12 = -2n)-6 = n
Move the 2n over the equals sign. Become 4n (as 6n-2n= 4n) and then if 4n=16 then n=4.
3 + 3n = 9 + 2n + 4n n = -2
4n - 2n = 84 2n = 84 n = 42
5n-2+2=4n 5n=4n n=0