(x-3)/2=(x+4)/3
    1+2=x
    (x-87.491)*50-2.34=3
    (3x-300)*（1+30%）=
    170.6+12.22*s-122.2 = 520+8.9*s
    (x-3)/2=(x+4)/3
    170.6+122.22*s-122.2=520+8.9*s
    170.6+12.22*s-122.2=100+105.5+5.58*s-55.8
    x∧2＋（1/3）×x∧3－（1/4）×x∧4=（4/3）
    x^3+3x-4=0
    100+140+10.21*s-102.1=170.6+12.22*s-122.2
    4.5x-9=4x-2
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=62088.31
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=232265.77
    1.25*s=0.81*(1-0.25*s^2)
    x^2-192.1x-14407.5=0
    x^2－101x+84=0
    x^2-2x-1=0
    x^2+7x+17=0
    120x^2-23052x-1728900=0

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