7*(8100*2*2+3700*3*x)>=4792*7*x+4792*6*(10-x)
    7*(8100*2*2+3700*3*x)>=4792*7*x+4792*6*(12-x)
    1-w/500>0.2
     (750-w)/750>0.2
    2150*x+1500*(x-1.72466)*x＞9700
    (500-w)*388500>(750-w)*280500
    1.3w<750
    1.2w<750
    (500-w)*588000>(750-w)*204000
    (500-1.2*w)*588000>(750-1.2*w)*204000
    (750-1.3*w)*280500>(500-1.3*w)*388500
    (750-w)*204000>(500-w)*588000
    (750-w-15)*280500>(500-w-15)*388500
    (750-w+15)*280500>(500-w+15)*388500
    (500-w)*388500>(750-w)*280500
    (750-w)*280500>(500-w)*388500
    16+a<5
    64x+1920＜80x+1680
    x^2-x>=0
    (480-w) * 30400 > (380-w) * 76000 (480-w) * 30400 > (280-w) *152000

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