express the following equations in the form ax²+bx+c=0

[tex] \frac{x}{6 } = \frac{5}{x - 1} [/tex]
[tex]x(x + 3) = 4 + x[/tex]
[tex] \frac{x - 2}{x - 3} = \frac{x + 5}{x + 2} [/tex]
[tex]x(x - 7) = 12[/tex]
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