$2xy\frac{dy}{dx}=y\left(2\right)-x\left(2\right)$
$\left(14b+13\right)^2$
$2\:x\:1\:x\:\left(-7\right)$
$m2-2m+4m+4.\left(-2\right)$
$-12\left(-3\right)$
$-\left(12-9\right)\cdot\left(8\cdot18\right)$
$15+10+18$
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