x+0.3x＝1023
    0.3x+x＝1020
    0.00887x^2+0.1266x+1=0
    x-[(x-800)*0.2]=70000
    a^4+a^3+a^2+a+1=0
    x-{（x-5000*9）*0.10-2520}=148500
    x-{（x-5000*9）*10-2520}=148500
    50000=30000（1+x）^4
    2x^2+7x-4=0
    Y=100+0.9Y+50
    100+0.9Y+50
    5.635*t^2-23.46*（t-10）^2=708.43
    75×7.80+13.07x=（75+x）×7.97
    75×7.80+13.07x=（75+x）×7.98
    (x-1.322)*100-0.2=0.8
    （26.813+x）×2.95＝53.627+72.74-x
    （26.813+x）×2.95＝53.627+73.24-x
    (x*6-20)/6=29.8
    750÷（1+x）-30x
    750x÷（1+x）-30x

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