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    (2x+1)(4+x)=30
    (84339-1.5X)*8.4/20.4*0.9=19522+7X
    4=5x
    3*x^3+x+2=0
    5x+800=1.3*15x
    x-xe^x-1+e^x=1.45
    100+(5*sqrt(3)-x)^2+1/3*x^2=x^2+(sqrt(3)/3*x+5)^2
    (k^2)*400*(1+k^2)+(1-k^2)*(50+40k^2)*(25+16k^2)=0
    -931.5+150/(1+y)+150/(1+y)^2+150/(1+y)^3+150/(1+y)^4+150/(1+y)^5+150/(1+y)^6+1150/(1+y)^6=0
    (2005+381-x)×5.35=9639
    (2005+261-x)=16408
    (2145-x)×5.35=6985
    (53-x)/x=0.309
    (20+x)(20+x)=(20+x)x
    X÷50+X*100=10
    X/50+Xx100=10
    0.2(x+5)=180/(x+5)
    -4(x^3)-32x^2=40x+80-(10(x^2)+100x+160)/2x
    x^4-10x^3-12x^2+10x+1 = 0
    x^4-5x^3-15x^2+5x+1 = 0

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