5.487*5% = x-6.2-(x/1.13*0.13-0.713)-(x/1.13*0.13-0.713)*0.12-(x/1.13+5.487)*0.0003-{(x/1.13-5.487-(x/1.13*0.13-0.713)*0.12-(x/1.13+5.487)*0.0003)*0.05}
     5.487*2%=x-6.2-(x/1.13*0.13-0.713)-(x/1.13*0.13-0.713)*0.12-(x/1.13+5.487)*0.0003-{(x/1.13-5.487-(x/1.13*0.13-0.713)*0.12-(x/1.13+5.487)*0.0003)*0.05}
     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}
    0.087x÷54＋0.0299(1-x)÷65=0.000985
    0.0957x÷54＋0.0319(1-x)÷65=0.001096
    xx-6x-10=0
    x2-6x-10=0
    2sinx+（cosx）²
    x^3+10*x^2+25x+15=0
    x＋606.85/x∧2＝106
    5000=(X-25)*400+5000
    4500=(X-25)*400+5000
    2.5%/(x-17.5%)=2/3
    2.5%/x-17.5%=2/3
    x^2-12x+24=0
    -x+(x^2+2x)^(1/2)
    -b+(b^2+2b)^(1/2)
    24y-2y^2=45
    24y*2y^2=45
    x^2-12x+45=0

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