50*sin(x)/sin(36)=20/sin(x+36)
    -147x^2+756x-780=0
    -1.1 | 6x^2+6x-5. | 3-6/7=0
    x^4-x^2+0.251=0
    5 x+6=11
    sinx=cos2x
    x^4-x^2+0.04=0
    51a²-3a-54＝0
    （1-x）（1-x）-4xx=0
    1*（1+x）^13=100
    0 = x^6-2*x^5-50*x^4+x^2-2*x+1
    1*（1+x）^10=100
    23.04+（3.6-0.625t）^2=（8-t）^2
    8*x^4=(4*x^2-3*x-2)*(1-x^2)*(3*x+2)
    ln(x/1-x)=1.5-9.2102
    ln(x/1-x)=1.5-9.0102
    （x-0.6）²+2.56=x²
    （x-0.6）²+1.21=x²
    x^2-8*x+25/4=0
    1000=100/（1+r)+100/（1+r)^2+100/(1+r)^3+100/(1+r)^4+100/(1+r)^5+100/(1+r)^6+100/(1+r)^7+100/(1+r)^8+100/(1+r)^9+100/(1+r)^10+100/(1+r)^11+100/(1+r)^12

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