$\frac{2}{x+4}=2+\frac{7}{x-6}$
$-15\::\:-5$
$\frac{\left(x^2-1\right)\cdot dy}{y^2-4}=dx\cdot2$
$0.001-0.0001$
$2x^2+3y^2+5z^2=900$
$1001\cdot\left(\frac{1}{2}x^2\right)^{10}\cdot\left(2y^3\right)^4$
$12-36+15.-3-\:\left(6\right).\left(-9\right)$
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