$\left(7x=11\right)^2$
$\lim_{x\to0}\left(\frac{2^x-1}{2^{x-1}}\right)$
$3a.\left(3a\right)^{8x-2.}$
$-2\cdot\left(+7\right)-\left(+6\right)\cdot\left(-3\right)+\left(+2\right)\cdot\left(-9\right)$
$\frac{m^2-16}{m+4}$
$15x^3y^2-20x^5y^2$
$-\frac{4}{3}\cdot\frac{-3}{2}$
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