(99-83)/(83-62)=(99-T)/(T-86)
    4x^3+15x^2+16x+6＝0
    x^2-0.225x+0.04
    x^2+0.225x+0.04
    3x+5-10=257
    5*x^3+1.05x+0.275
    0.3/(x-1)-0.5/(x+2) =12
    t*(t+1)*(0.5*t+1)=25
    x^2-0.71x+0.0169
    x/abs（x）
    x+10^0.2x+2*10^4*x^2=1
    x^2+2*31.68*x=2.87*10^3*16*15
    x*16*5=(448.6)^2+2*448.6*31.8
    -4^x㏑-4=-2^x㏑（2）
    0.5*[(646.8)^2+2*646.8*x]=(448.6)^2+2*448.6*x
    32=(4*sqrt(3)-x)²+xx
    s^3+8s^2+12=0
    （100-x）（300+5x）=32000
    x^2+252x-141.75=0
    -8a^3-64a^2-128a+12=0

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