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n in (-oo:+oo)
3*n+6 = (1/6)*n+65/8 // - (1/6)*n+65/8
3*n-((1/6)*n)-(65/8)+6 = 0
3*n+(-1/6)*n-65/8+6 = 0
17/6*n-17/8 = 0 // + 17/8
17/6*n = 17/8 // : 17/6
n = 17/8/17/6
n = 3/4
n = 3/4
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