$2x+3x+6x-5y$
$y=\left(-2x^2-x\right)\frac{1}{x}$
$20\cdot5$
$-2\left(3a+5b\right)$
$x^2-3x-20$
$\sqrt{\cot\left(x\right)^2+1}$
$sin\left(x\right)=-0.1$
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