$10xy+12xy-\left(-4xy-2xy\:\right)$
$3\left(x-2yz+y^{2}\right)-4\left(x^{2}-y^{2}-3yz\right)+x^{2}+y^{2}$
$\frac{2}{x+3}+\frac{3}{x+2}$
$\int\left(\frac{7}{2x}\right)dx$
$18-4,5a^4$
$3x^2-2x-3=0$
$sinx=-\frac{\sqrt{7}}{3}$
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