$x^2y\:-\:xy\:+10x\:-\:10$
$980.76+465.65$
$-12-\left(-45\right)$
$16a^2-49b^2$
$x^2+12\ge8x$
$\left(2x+5\right)-\left(3x+7\right)^2$
$2+4+20-40+288$
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