$\frac{m^{18}-n^{18}}{m^3-n^3}$
$4 + 1850 - 10$
$-\frac{x-15}{x+5}$
$y'\:+2ty=3t$
$-1.5\cdot6$
$10x^3+30x^2$
$-12,43+8,51$
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