x^-3/4
    x-24×5÷3=120
    180*0.5+100*0.6+(x-280)*0.9=139.2
    18x=27(x-5)
    3x^2-16x+36
    1/x+1/(x+2)+1/(x+10)=0
    4x2+98x-145=0
    x^2+1/x^2
    3x/4=3x/10×6/5-30
    x^4-x^2-0.74=0
    2/3-3/10-a=-2/1
    2.1÷x=3
    (100-3x)÷2=8
    x-6.5-(x/1.13*0.13-0.748)-(x/1.13*0.13-0.748)*0.12-(x/1.13+5.752)*0.0003-{(x/1.13-5.752-(x/1.13*0.13-0.748)*0.12-(x/1.13+5.752)*0.0003)*0.05}=0.2876
    x-6.5-(x/1.13*0.13-0.748)-(x/1.13*0.13-0.748)*0.12-(x/1.13+5.752)*0.0003-{(x/1.13-5.752-(x/1.13*0.13-0.748)*0.12-(x/1.13+5.752)*0.0003)*0.05}=0
    x-6.5-(x/1.13*0.13-0.748)-(x/1.13*0.13-0.748)*0.12-(x/1.13+5.752)*0.0003-{(x/1.13-5.752-(x/1.13*0.13-0.748)*0.12-(x/1.13+5.752)*0.0003)*0.05}=5.752
    sinx+sin1.5x
    x-11300-(x/1.13*0.13-1300)-(x/1.13*0.13-1300)*0.12-(x/1.13+10000)*0.0003-{(x/1.13-10000-(x/1.13*0.13-1300)*0.12-(x/1.13+10000)*0.0003)*0.25}=500
    x-11300-(x/1.13*0.13-1300)-(x/1.13*0.13-1300)*0.12-(x/1.13+10000)*0.0003-{(x/1.13-10000-(x/1.13*0.13-1300)*0.12-(x/1.13+10000)*0.0003)*0.25}=500
    x^2-17.271*x=626.45

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