$7=\ln\left(x+6\right)$
$ctg\:5x=\frac{\sqrt{3}}{3}$
$-5y^2\left(15y-4y^2\right)$
$2x^2-8x-10=32$
$50\:\left|-50\right|$
$4x^2-3x^2+2y-x$
$5b+-b^2+-10$
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