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$\left(9a-c\right)^2$
$15x^3x^2-25x^2y$
$\frac{72}{\left(-36\right)}$
$\frac{3x^2a}{x}-5xa-\frac{7x^{-2}}{x^3a^{-1}}$
$4\left(10\right)+25$
$2-3\left(x+5\right)-4+7\left(2x+1\right)$
$2z+5+7x+13$
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