$4x-9+-5x+2$
$4\ln\left(x-7\right)=-8$
$8\cdot108$
$\left(\frac{2}{5}xy-\frac{3}{4}x^{n+1}\right)^2$
$8\:+\:\left(-5\right)\:+\:4\:-\:2\:-\:\left(-3\right)$
$2478-2622.07143$
$21m^2n^3-28m^3n^2+35m^3n^3$
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