$\left(+135\right).15$
$\left(a\:\:-\:\:15\right)\:\:\left(\:a\:\:+\:\:10\right)$
$5\cdot4+6$
$38-\left(-4\right)$
$4\sin\left(x\right)-5=-6$
$\lim_{x\to5}\left(\frac{10x^2-50x}{x^2-25}\right)$
$\left(-3m^2+6mn\right)^2$
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