$\frac{5}{1+0.0039\cdot43}$
$5a^2-70a+245$
$y\left(2y+3\right)=5$
$49x^2-81y^6$
$11\:csc\:x\:+\:15\:=\:9\:csc\:x\:+\:19$
$-\left\{-\left[+8-8\left(7-3\right)+2\left(-5\right)\right]\right\}$
$4x^7+6x^6y-20xy-32x^2+6y$
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