$-6x^2-7x+3$
$\left(\frac{x^6}{x^5}\right)^{-2}$
$98\cdot98$
$-147+-45+25$
$\frac{\tan\left(x\right)+\cot\left(x\right)}{\tan\:\left(x\right)\cot\:\left(x\right)}$
$\frac{3}{2.5}$
$3\cdot2^2+7$
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