The operator (+ or -) before the 5 (and before the 6, but that doesn't matter for the discriminant) is missing from the question, so:
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It is an equation and the value of x is -5
6x - 5 -5 = 0 6x -10 = 0 +10=+10 6x=10 x= about 1.4
If you mean: 6x-5 = 31 then x = 6
6!
6x + 8 = 13, 6x = 13 - 8, 6x = 5, x = 5/6