$\frac{\:\frac{9}{x}+\frac{3}{x^2}}{x+\frac{1}{x}}$
$50x-80y$
$4x+1=3x+3$
$-9\:-\:\left(-14\right)-\left(-20\right)$
$0.09x^4-0.64y^6$
$3\sec^2\left(x\right)+10\sec\left(x\right)=-8$
$-10\left(2.4-3.8\right)$
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