$\frac{d}{dy}\left(\ln\left(xy\right)+5x=30\right)$
$\left(2a+3b\right)+\left(2a-3b\right)$
$24x^2-36$
$a^27a-60$
$10.-8+4.3$
$\left(x-7\right)^2-\left(x+7\right)^2$
$x ^ { 2 } - 17 x + 30$
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