已知|3x-1|+(3y+6)^2=0,求整式(2x^2-3y^2-8xy+7)-(-x^2+4y^2+7xy+6y+3)的值
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![已知|3x-1|+(3y+6)^2=0,求整式(2x^2-3y^2-8xy+7)-(-x^2+4y^2+7xy+6y+3)的值](/uploads/image/z/2835182-38-2.jpg?t=%E5%B7%B2%E7%9F%A5%7C3x-1%7C%2B%EF%BC%883y%2B6%29%5E2%3D0%2C%E6%B1%82%E6%95%B4%E5%BC%8F%EF%BC%882x%5E2-3y%5E2-8xy%2B7%29-%28-x%5E2%2B4y%5E2%2B7xy%2B6y%2B3%29%E7%9A%84%E5%80%BC)
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