$x^2-8x+45$
$\frac{\left(-x^4+18x^2-10x+8\right)}{x-4}$
$x^2-x+2>0$
$7x^2+10=5x$
$3\left(x-1\right)-2\left(x+1\right)=0$
$6+y=-8$
$623+147$
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