（x-3）+（X+3）+x/3+3x=48
    x/3+3x=48
    x/3+3x=48
    （X-3）+（x+3）+x/3+3x=48
    10x+50（x+2）+100（46-2x)=1760
    100x+50（x+2）+100（46-2x)=1760
    tanx-1+x=0
    tanx-1+x=0
     x^3-2x^2 = 144
    x*100*0.95-x*60-100000=0
    (318.95+0.15×n)÷(376+n)=0.4
    (1+1/x)∧X
    4*x*x*x-3x-1=0
    (x+0.186)*x=2.21*(0.062-x)*(0.8755-x)
    (x+0.1875)*x=2.21*(0.0625-x)*(0.875-x)
    10.78125*sin(2π*x)-109.14*x+17.25=0
    (x+0.1875)*x=2.21*(0.0625-x)*(0.167-x)
    10.78125*sin(2π*x)-81.54*x=0
    x^4-x^3-x^2-x+3
    x^4-0.6x^3-0.6x^2-0.6x+1

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