$\left(9x+y\right)dx+\left(x+9y\right)dy=0$
$\frac{\left|x\right|}{\sqrt{4+x^2}}$
$121x^{12}-198x^6+81$
$\sqrt[999988]{1}$
$x^2+18x+162$
$5x\:-\:9\:=\:10x\:+\:1\:$
$2x\cdot3+4x\cdot2+2x$
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