$x^2+9x-20$
$+\left(+8\right)-\left(+15\right)b+\left(-2\right)+\left(-16\right)$
$\frac{\left(5-x\right)}{\left(2-x\right)\left(1+x\right)}$
$-15\:-\:\left[10\:-\:\left(8\:+\:4\right)\right]\:$
$5x^2y\:12x^2y$
$\left(-11-10i\right)^2$
$4\left(x^2-1\right)-3\left(x+1\right)$
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