$9+3^2-8+5$
$4x^2-28x+49$
$-6-y$
$-5cos^2x-2sinx-2$
$12\:a\:2\:+\:8\:a\:+\:5\:a\:2\:-\:7a\:-\:5\:a\:2\:+\:9\:a\:+\:7\:a\:2\:-\:5a$
$3u^2-11-5$
$\left(2-9\right)-5\left(8-12\right)-7$
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