$n^3+9n^2+18n+80$
$x^2-7x=7$
$49r^2+14r+4$
$9x^2+18x+10$
$-x_{2}-8x-1.00870$
$2+\left(+12\right)\:-\left(-4\right)$
$\left(5xy-2\right)^3$
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