$3rn^{-5}\cdot6r^{-3}n^4$
$\left(100-0.25x\right)^2$
$x^2-8x=4$
$\frac{3}{2+4x}$
$3\left(4x+5\right)-2\left(4+4x\right)$
$2sin^{\left(2\right)}\theta\:-sin\theta\:-1=0$
$0.78w+w-0.91w$
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