(x+1)－2(x－1)=7－3x
    35/3*3.14*(14*14+x^2+14*x)=35000
    2(x＋2)＝3(x－1)＋x
    5x－2(x－3)＝15
    4(x+1)＝6x
    X+(x*0.13)=3174619.07
    3(x+2)＝2x＋10
    x^4-4x^3-12x^2-19x+60=0
    5x－3.9＝3x＋8.1
    1=12*x/11+8(1-x)/9
    -90-arctanx-arctan0.1x=-180
    sin(arccos(x))=π/3
    x^4-4x^3-12x^2-51x+60=0
    x^48=53.7x-52.7
    ((100*0.1108*0.7854)/(0.02758-0.1108))*(exp(-0.1108*x)-exp(-0.02758*x))=40
    850000000=5720*（840x-x*x/2）
    -12500-x-(x+50000)*12%/12 >= 5000
    （40%＋15）÷（60%－15）＝3÷4
    x^4-4x^3+14x^2-66x+62=0
    2=0.8/(1+r)+0.8/(1+r)^2+0.8/(1+r)^3

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