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If you mean: 13*(x -1) +6 then it is 13x -13 +6 = 13x -7 as an expression
Since 7x + 13x +2x + 8 is an expression (there is no equal sign), there is no answer as to what x equals. However, this expression can be simplified to 22x + 8.
It's a quadratic expression: x²+13x+12 If, for example, x²+13x+12 = 0 then there are 2 roots, x=-1 and x=-12
If you mean 12x104=13x1 that is called an arithmetic error. Perhaps you mean an algebraic equation for x, such as 12x + 4 = 13x +1, so subtract 12x from both sides, and then subtract 1 from both sides and you get 3=x