$2a^3\cdot2a^{-2}\cdot a^4$
$\left(1.999\right)^4$
$\sqrt{2x-3}-x=-3$
$7+25+-1$
$12+12x-3x^3-4x^2-12x-9$
$\frac{2x-1}{3}-\frac{1}{4}>4+\frac{2x-10}{8}$
$\frac { x ^ { 5 } y ^ { - 4 } } { x y ^ { - 1 } }$
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