$\left(-15\right)+\left(-1\right)+\left(+2\right)-\left(-1\right)$
$\left(3x+2y\right)\left(x+3y\right)$
$x+8\le4$
$\left(\frac{-6a^5b^9}{2a^7b^{-5}}\right)^3$
$7\cdot13$
$\left(x^2+y^{2n}\right)^3$
$\left(r-54\right)\left(r+1\right)$
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