1/2x-2+x=118
     (X-X^2-X^2)*X/2 = 80
    (X-X^2-X^2)*X/2=80
    (X-X^2-X^2)*X/2=20
    (2+x^2+2+x^2+3)*x/2=15
    1215294-0.06X=X
    0.2×10.84^0.2
    2^1.2
    4.94^0.2
    -5x^2+80x+400
    -5(x^2-16x)+400
    (4+0.4n)*(20-n)
    X^7+X^6+100X^3=1000
    x^3-3x^2-9x
    sin(1.6016x)=2.38 sin(0.8008x)=0.89
    sin(1.6016x)=2.37979 sin(0.8008x)=0.89
    sin(0.8008x)=0.89
    sinh0.8008=0.89
    0.5x+5=0.6x-75
    x^2-x+1=0

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