$77y+6y$
$36x-2\:\:-\:2x-4\:+\:2$
$2m^6-6m^2+9m^9-5m^5$
$3x+7=7+9y$
$[\frac{5}{2}x^{2}y^{2}-\frac{4}{3}][\frac{2}{5}x^{2}y^{2}+\frac{4}{3}]$
$cot\:a\:+tan\:a\:$
$17.5x^2+162.4x-8598.72$
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