$\:-2a\:=-\:48\:$
$\cos\left(x-40\right)=0.8$
$\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:58y-34y+x+x$
$5b\:-\:8n\:-\:2n\:-15b\:+3b\:-\:2n$
$64n^4-9n^{14}$
$\int25sen^2xdx$
$x^2+5+2x-6-x-4+-x+6$
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