$\left(8x^a\:y^7+5x^11\:y^b\:\right)$
$2x^2+3x^2-\:7x^2+10x^2$
$2.6r\:+\:1.3\:=\:-16.9$
$1\frac{x}{3}$
$\frac{5\:2}{5\:-3}$
$22x-220$
$x\:^2\:+2x=8$
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