124.4+48+（22－x）*4.3＝（50+89.2+6.5x）/1.5
    124.4+（22－x）*4.3＝（50+89.2+6.5x）/1.5
    1/4x-x=6
    x+24%*x
    16=24+x+24*x
    16=24+x+24*x
    16%=24%+x+24%*x
    (2500-x*100)*x=39000
    (2500-X*100)*x=39000
    X^6-7X^5+8X^4+33X^3-30X^2-63X-27=0
    （1+30%）X=4.55
    X^6-7X^5+8X^4+33X^3-30X^2-63X-27=0
    X^2=5
    2x+3=2
    100+x=(170+x)×0.618
    （16-x）×（160+40x）=3840
    2x+5=25-8x
    6x^2-11x+3=0 6x^2-15x+6=0
    2x^2+7x+5=0 8y^2+6y-3=0 4x^2+15x+9=0 2x^2-5x+3=0 5y^2-21y+18=0 15x^2+x-2=0
    2x^2-3x-20=0 4x^2+24x+7=0 6x^2+x-35=0 2x^2+5x+7=0 6x^2-9x-6=0 5y^2-8y-13=0

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