0.07=0.0003×x2-0.0161x+0.2626
    8%*x+9%*(6000-x)=500
    (720-x)/x=-0.1
    3*x+5*(42-x)=150
    (720-x)/x=0.1
    15.2953=(354.8304-x)/log((364.8304-x)/10)
    15.1266=(353.378-x)/log((363.378-x)/10)
    200+0.5y+500=y
    0.9956*x - 0.0039=1
    0.9956*x - 0.0039=0.3
    411.52*x - 0.0535=10
    411.52*x - 0.0535=4
    411.52*x - 0.0535=0.4
    411.52*x - 0.0535=0.3
    5x²+30+13x=0
    9X^2-450X+5400=4536
    x(18-x)=80
    (20-2x)(8-2x)-x(8-2x)=56
    (30-x)(20-x)=551
    (37-25-x)(4+2x)=90

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