$9x-3+2x-4x+11$
$\frac{-6a^{-5}b^{8}}{-2a^{-6}b^{10}}$
$\left(x+\:y\:+\:3\right)\:x\:\left(y\:+\:1\right)$
$\left(6x^3+8x^2\right)\left(18x^2-3x-5\right)$
$516\cdot4,2$
$7\cdot\left(-1+-2\right)$
$-7x=-7$
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