$\left(-7y+5\right)^2$
$18x^2=65x-7$
$\frac{x+2}{x^2-7x+12}$
$2x^2+10x$
$12x^3y^3z+6x^3y^3z$
$1+\frac{7}{x+6}=\frac{7}{x^2+13x+42}$
$2\sqrt{x+1}=-2$
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