$5x+6\:\cdot5x+6$
$y=arctan\left(\sqrt{\frac{1+x}{1-x}}\right)$
$\left(\frac{4a^2b}{b^3}\right)^{-2}$
$\frac{5s^{-7}}{10s^{-9}}$
$15-6x\:\:15\left(1-6x\right)$
$6xy\:and\:4yx$
$2500x+754y=900$
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