$\frac{x^4}{x^3}$
$12\cdot3+25\cdot2-10\cdot$
$\frac{1+\sin2x}{\sin2x}$
$a^2-31a+630$
$x^{12}-y^2^4$
$4v^3\:x\:vu^2$
$\left(-x-7\right)\:+\:\left(-9x+6\right)$
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