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    x=[i for i in range(0,20)]

    ''' 4x - 5y + 33 = 0 x = ( 5y - 33 ) / 4 y = ( 4x + 33 ) / 5

    20x - 9y - 107 = 0
    x = (9y + 107)/20
    y = (20x - 107)/9
    

    ''' t=7 print( ( 9 * t + 107 ) / 20 )