$\left(-26+36:4\right).2-174:\left(-7+1\right)$
$\frac{3^{-2}}{3^0}$
$3-2\:x\:5\:+7\:x\:4$
$1.3\cdot\frac{1}{6}+9.9-9$
$\left(2x^{-3}y\right)^4\left(x^{20}y^6\right)$
$\left(4y^5\right)^2$
$\left(3x^6-5x^5\right)\left(3x^6+5x^5\right)$
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