(7600-((10000/70)-(27600/(x+70.4)))*(x+70.4))/(x+10.4)+(10000/70)＝150
    1/x=4
    1/x+4
    (10000-((10000/70)-(27600/(x+70.4)))*(x+70.4))/(x+10.4)+(10000/70)＝150
    (10000-((10000/70)-(27600/(x+10.4+60))*(x+10.4+60)))/(x+10.4)+(10000/70)＝150
    25-25X+0.5+2.5X = 24
    30-30X+2.1+3X = 26
    -arctanx-arctan0.2x-arctan0.1x=-180
    x^2 - 5x + 6 = 0
    30-30X+2.1+3X=26
    2b^2 - 5b + 4 = 0
    30X-30X+（21+30X）*0.1=26
    20.5+X-（X*2%）=50
    x^3+x^2+1 = 0
    (47+x)/(87+x)=0.55
    (x-x/1.09*0.03)*0.02=4798406.39
    6*cos(x)^3-6*cos(x)^2-23*cos(x)+18=0
    x=arccos(2/3)
    x=arccos2/3
    x^4-x^3-x^2-x-1=0

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