\(=\left(6x^3-10x^2-18x^2+30x+21x-35-5\right):\left(3x-5\right)\\ =\left[2x^2\left(3x-5\right)-6x\left(3x-5\right)+7\left(3x-5\right)-5\right]:\left(3x-5\right)\\ =2x^2-6x+7\left(\text{dư }-5\right)\)
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