3x−50=4x
    4x−50=7
    3x−50=4
    3x−50/5x-50=4/7
    X+X*0.04=645
    90*(1-x)(1-x)=40
    (40-x)(20+2x)=1200
    (x-4)[500-10*(x-5)]=4100
    (x-4)[500-10*(x-5)]=4100
    （x-30）[600-10*(x-40）]=10000
    x^2+1=145x/12
    x*0.975*0.95+567=1500
    120X-27000-120X*5%=8100
    sin(2x-5π/6)
    x^2- 15.5x + 59.6=0
    65435656=10^9*a/(6.25-a)/(12.5-a)
    65435656=10^9*a/(25-a)/(12.5-a)
    e^(-(-74.163+6.63*4.19)*1000/8.314*310)=a
    65332488=10^9*a/(25-a)/(12.5-a)
    e^(-(-74.163+6.63*4.19)*1000/8.314*310)=10^9*a/(25-a)/(12.5-a)

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