$51\:-\:\left(-12\right)$
$\frac{-y-y^5+2}{y+1}$
$8x^2-48x+64$
$-\left(8+3\right)-\left(-11+7\right)$
$\frac{1}{-\cos\left(x\right)\tan\left(x\right)}$
$2x^2-3x+3<0$
$-\frac{90xyz}{-10y}$
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