$\frac{\left(2-y^2\right)}{\left(y^2-2y\right)}$
$12\:.\:11\:-3\left(4\right)\:+4\left(3\right)$
$9^2\:x\:\:9^9$
$\infty+70$
$\left(6r^3\right)^3$
$2\left(x-1\right)\left(x+3\right)+\left(x-1\right)^2$
$8x^2-22x+15$
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