$-7-10\log_{6}r=-27$
$tanh^{-1}\sqrt[4]{x}$
$x^2+16x+128$
$\frac{y^8}{x^{-3}x^7y^6}$
$2x+8,\:\:5x-11$
$\frac{x^4+2}{x^2+6x+6}$
$20x^2+280x+678$
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