$4xy-6zy-8xz+3zy$
$2\cdot\left(\left(5x+3\right)\cdot\left(5x-3\right)+\left(5x+3\right)\cdot5x+\left(5x-3\right)\cdot5x\right)$
$-\left|5\right|=-8$
$4-2x\ge10$
$-5z-9=-6z$
$\left(3x\:+2\right)\left(x^2-7x+4\right)$
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