5⋅3⋅7−95\cdot3\cdot7-95⋅3⋅7−9
z2−z−72−z+8\frac{z^2-z-72}{-z+8}−z+8z2−z−72
(13k)(2k2)\left(13k\right)\left(2k^2\right)(13k)(2k2)
z(x2y−z2+xyz)z\left(x^2y-z^2+xyz\right)z(x2y−z2+xyz)
2y′=xy+yx2y'=\frac{x}{y}+\frac{y}{x}2y′=yx+xy
(9x)2(2x)2\left(9x\right)^2\left(2x\right)^2(9x)2(2x)2
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