$s^2-4s-21$
$16+5-26+3-6-14$
$2x^2+10x+7=0$
$\left(2q+3s\right)^2-6\left(2q+3s\right)+9$
$7 x ^ { 4 } y + 5 x ^ { 2 } y + 10 x$
$\int\left(3x-x^2\right)\sin\left(2x\right)dx$
$24x+42y$
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