$\left(78\right)-\left(-63\right)$
$\frac{d}{dy}\left(x^2+3xy+y-1\right)$
$3\:-\:3x\:+\:5x\:-\:13$
$216x^3+8y^6$
$\left(xy+27\right)\left(xy-27\right)$
$\left(x+d\right)\left(x-d\right)$
$8y+21\ge2y-54$
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