3x−50/5x−50=4x/7x
    -11200+x-x*2%*3=1000
    -11200+x-x*2%=1000
    31.3+x-x*6%*3/12=51
    20x=30(x-7)
    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

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