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    2^x+7^x+x^2+x=-125
    ((e^x-1)/(e^x+1))^2=-1
    2^x+7^x+x^2+x=-125
    abs(x)=x
    x^4=121
    x^2=11
    x^2-2√2x/5-17/50
    abs(x)^(1/x)=√2
    √(x^2+1+abs(2x))=abs(x)+1
    x*0.71*2.42*1.01=1.59
    (7/2X-36)/3
    20x-(15x+80)=0
    5.0691=(26.99*0.829*(x+0.1))/(1+0.829(x+0.1))*(100-7.84-1.06/100*1/(1+0.31*1.06)+(2.96(x+0.1))/(1.31*0.101325)
    7×x^x+71×x-25
    [x-2]+[5x-1]=9x-2.5
    50+4×x^x+20×x=15+3×x
    0.05x+11-0.55x=10.6
    x^2-4x-3=0
    (16-x)+(14-x)+(14-x)=34.8
    (16-x)+(14-x)+(14-x)=34.8

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