4x - ( 3y - 2 ( 3x - 3 ( 6y - 2x )))?
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4x-(3y-2(3x-18y+6x))
4x-(3y-18x+36y)
4x-(-18x+39y)
4x+18x-39y
22x-39y
4x-(3y-18x+36y)
4x-(-18x+39y)
4x+18x-39y
22x-39y
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