$-5\left\{-5\cdot\left[\left(3\cdot5\right)-15\right]\right\}$
$y=\left(x^3-2x\right)^2$
$16a^4-81b^4$
$\frac{1}{2+4x}$
$4a^2+24a-36$
$\left(a+b+c\right)^2=1$
$x^2-12>0$
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