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    (400-240-10x)(200+4x)=41600
    40x*(400-240-10x)=41600
    12.6x∧2-5.44x+0.544=0
    2500*(1+x)^2=3025
    2500x^2+5000x-525=3025
    2500x^2+5000x-525=0
    3.6533=(26.23*0.681*(x+0.1))/(1+0.681(x+0.1))*(100-14.9-0.96)/100*1/(1+0.31*0.96)+(1.45(x+0.1))/(1.36*0.101325)
    (10-x)(8-2x)=54
    4.3261=(26.23*0.681*(x+0.1))/(1+0.681(x+0.1))*(100-14.9-0.96)/100*1/(1+0.31*0.96)+(1.45(x+0.1))/(1.36*0.101325)
    X(200-2X)+100(50-X)=6240
    (605/216)x∧3-2x∧2+058x-0.042=0
    x^3+x-1
    500(1+m%)×1000(1+m/2%)=660000
    3/(2+x)=15
    3/(2+x)=15
    x+4=7
    x(x+3)=65
    20x^2-52x+5=0
    (y-60)(220-2y)=1200
    5000(1+x)^2=4050

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