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    4-3(100-x)(100-x)/1600=3.63
    a^2+a=240
    a=2a-1
    0.5x^2-2x-6=6
    0.5x^2-2x-6=0
    9-x^2=16-(5-x)^2
    (X+800/12)48+242X+(X-800/12)41=274554
    9/(x+1.75)+0.5*x*(x+1.75)*(x+1.75)=1.25
    11450*(1+18%)^(n/2)=29545.88
    11450*(1+18%)^n=29545.88
    11450*(1+18%)^(n/2)=29545.88
    11450*(1+18%)^(n*2)=29545.88
    13000*R^3.5=4322
    13000*(1+R)^3.5-13000=4322
    13000/x+10000/(x+11.8)=150
    13015+3140*(1+x)-2868+3140*(1+x)^2-3015+3140*(1+x)^3-3025=14000
    50y^4-25y^2-175y-500=0
    (X+500/12)84+312X+(X-300/12)35=381673
    (40-x)(20+2x)=1250
    √1-cosA=1:3*√3

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