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
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x2+12x+11=0 (x+11)(x+1)=0 x=-11 or x=-1
The equation is equivalent to: -3x2 - 12x - 1 = 0 [you could change signs to get 3x2 + 12x + 1 = 0 but that is not required] The discriminant is (-12)2 - 4*(-3)(-1) = 144 - 12 = 132
2x2 - 13x - 7 = (2x + 1)(x - 7)
If you mean: 13*(x -1) +6 then it is 13x -13 +6 = 13x -7 as an expression
x . 9 =12-3x9x =12-3x9x+3x=1212x =12x =1