20%x÷20%=72÷20%
    20%x=72
    （1-80%）x=72
    2x-30%x+30%x=9.2-30%x
    2.3x÷2.3=9.2÷2.3
    2x+30%x=9.2
    0.2x÷0.2=3.36÷0.2
    18-2x+4x=40-4x+4x
    x^2+60x+600=0
    4x^3-4x^2+9＝0
    x-4/2022+x-3/2023+x-2/2024+x-1/2025=4
    a*（5a+48）=（a+6）*（5a+12）
    x*sqrt(1+x^2/4)=4
    0.06x^2+2.64x-1.21=0
    0.06x^2+2.64x-1.21
    （2x+20)*(2x+20)=2249
    5a = 10
    y-193.152=1.006y/0.9997
    3*x^12-75*x^11+818*x^10-5126*x^9+20452*x^8-54386*x^7+98002*x^6-119112*x^5+95073*x^4-47057*x^3+12937*x^2-1595*x+60
    x^14-29*x^13+375*x^12-2859*x^11+14322*x^10-49742*x^9+123168*x^8-220032*x^7+283171*x^6-258347*x^5+161326*x^4-64788*x^3+15055*x^2-1669*x+60=0

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