$x^2-55x+254$
$\frac{3}{2x+5}+\frac{x-7}{4x^2+10x}$
$\frac{5}{11}x+\frac{2}{3}x-\frac{1}{6}x=189$
$x^2-8x+81=25$
$y'\:=\:\frac{xln\left(x\right)}{y^2}$
$\left(\frac{5}{9}\:m^4n^3\right)\left(-\frac{3}{10}m\:n\right)$
$d^2=2400$
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