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-3x²(x-2/3y)+5x(x²-7xy) = -3x³+2x²y +5x³-35x²y = 2x³-33x²y
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-2√2(a+√2b)-4(a√2-2b) = -2√2a-2*2b-4a√2+8b = -6√2a+4b