$a+3b,a=-7,b=2$
$x^2-12x+20=0$
$3x^{-2}+2x^{-2}$
$15+30+210$
$\frac{81x^2-16}{9+4}$
$\csc\left(x\right)^2-6\csc\left(x\right)$
$y'=\frac{y}{x}+5x$
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