$( x - 6 ) ( x - 5 )$
$6r\:+\:13r\:$
$10-3^2+5+4\cdot2$
$2b^2+2b-4$
$\frac{d}{dx}8-y^2=5x^3-x^2y$
$b^2-2b-35=0$
$3 x + 2 \leq x + 5$
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