$2xy-7x-8y+28$
$x^2+14x\le0$
$\log5\left(125\right)$
$\frac{x^3}{\left(1-x^4\right)^2}$
$-16.345+21.437+3.45$
$\left(y\right)\left(-3x+4\right)$
$\left(\frac{1}{\sin\left(x\right)^4}\right)-\left(\frac{\cos\left(x\right)^4}{\sin\left(x\right)^4}\right)$
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