$\left(2a-6\right)\left(a-13\right)$
$\int_1^2\sqrt{4-x^2}dx$
$\left(2b+4a+3c+11\right)+\left(18b-12a-15c\right)$
$x^4-x^4+x^2-6+x+3x-2$
$x-4>-1$
$\left(-4q^2+200\right)-\left(22q+1250\right)$
$7x-2=-23$
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