4500 ⋅ 104500\:\cdot\:104500⋅10
−8b−8b-8b-8b−8b−8b
a2+21a−20a^2+21a-20a2+21a−20
limx→3(x2−9x−1)\lim_{x\to3}\left(\frac{x^2-9}{x-1}\right)x→3lim(x−1x2−9)
−17−(−67)-17-\left(-67\right)−17−(−67)
8x−7y−(3−6y)\:8x-7y-\left(3-6y\right)8x−7y−(3−6y)
(8a−7b)(2)\left(8a-7b\right)\left(2\right)(8a−7b)(2)
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