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    √(1+e^z)+√(1-e^z)=√5
    √(1+e^z)+√(1-e^z)=1
    √(1+e^z)+√(1-e^z)=√2
    √(1+e^z)+√(1-e^z)=√3
    x^2=2^x
    2x^10+3x^9=-243
    exlnx=1
    (x^2-1)^-1/2
    sinx=0.733
    0.53*1.1*x=2.05
    (x+200)÷(1-10%)=(x+100)÷(1-10%)
    x^3-50*x^2-120=0
    -3x^2+4x+7=0
    (a-17.17)÷17.17*100=2.5
    (a-17.17)÷17.17*100=2.5
    x*1.1*3.09=3.71
    -2x+5=6
    -2x+5=6
    1.6x-(2x-150)=54
    X/(1+9%)*9%=2113.48

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