Simplified into a general form of quadratic equation, please explain, thank you 3x square + 1 = 6x (3x-2) (x + 1) = x (2x-1)

The general form of quadratic equation with one variable is ax ^ 2 + BX + C = 0 (a ≠ 0) x ^ 2, which represents the square of X
therefore
3x + 1 = 6x is reduced to 3x ^ 2-6x + 1 = 0
(3x-2)（x+1）=x(2x-1)
3x^2-2x+3x-2=2x^2-x
3x^2-2x^2-2x+3x+x-2=0
x^2+2x-2=0

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