4x-8x×x×x＝1
    x/2=3x-3
    3-（-2x-5）+2x=9
    4x-8x×x×x＝1
    t^2-18 t+54.75=0
    t^2-18 t+54.75=0
    √（64-x^2）+√（36-x^2）=5
    9(x-3)^2-2=14
    2.34*3x=4.914
    7.2-3x=2.46
    57*(x+10)+63x=1350
    2.8x-14.4=x+14.4
    (16-2x)/3=0.4
    x^3+2sqrt(3)x^2+3x+sqrt(3)+1=0
    x*x-328x-328*328
    200+x=160*6
    3x+210=486
    1.4x-115*1.4=161
    7(x-0.7)=4.9
    5.8x-3.3x=20

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