$^{2\left(a+b\right)^2+5\left(a+b\right)-3}$
$u^2-10u+25$
$r^2-16r$
$3.25\cdot4.8$
$\lim_{x\to6}\:\frac{x^3-216}{x-6}$
$\sqrt[4]{x^{-4}}-4x^3-21$
$2x^2+24x+72=0$
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