$\frac{7^{10}}{7^9}$
$-20x^2+160x+10y^2+60y-225=0$
$20.5\:^{-1}\:+\:16.2^{-2}\:+\:32.4\:^{-1}$
$m^22m^2-7m^2$
$2x^2+12x+18-3x\ge12$
$\sqrt{180}-\sqrt{80}$
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