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In 3n-1 equals 11, n is 4.3n - 1 = 113n - 1 + 1 = 11 + 13n = 123n/3 = 12/3n = 4
12n + 8 = 11 12n = 3 n = 1/4
n=3,y=4 2(n+3y)=30
When n = 4, 3n = 3*4 = 12
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