$\frac{\sqrt{1+3}-2}{1-1}$
$x^4-12x^2-36$
$\frac{x}{9}+64=100$
$g\left(x\right)=\cos\left(2x+4\right)^4$
$\frac{9}{x-1}+2=5$
$f\left(x\right)=\:-5x\:-\:6$
$20w-3x+2w+9x$
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