1*2X-1*（2/3X）=15
    [-sqrt(3)*(x-1)]^2=4x
    y^2+4sqrt(3)y/3-4=0
    12614.06*（1+x）^10=20000
    2x^5-72x^3+13x^4-36*14x^2+18*18*4=0
    2x^5-72x^3+13x^4-36*14x^2+18*18*4=0
    0.98x➗3800=112➗160
    156.8x=452600
    700/x=900/(x+20)
    700/x=900/x+20
    x/700=x+20/900
    25+x＝32+144.87-x
    X-X*0.065-X*0.0003=2200000
    140*3.5964+4*3+4*2+3.4*2+4=(140+3+2+2+1)*x
    140*3.5964+4*3+4*2+3.4*2=(140+3+2+2)*x
    140*3.5964+3.6*3+4*2+3.5*2=(140+3+2+2)*x
    140*3.5964+3.6*3+4*2+3.4*2=(140+3+2+2)*x
    140*3.5964+3.6*3+4*2+4*1+3.4*2=(140+3+2+1+2)*x
    140*3.5964+3.6*3+4*2+4*1+3.5*2=(140+3+2+1+2)*x
    140*3.5964+3.6*3+4*2=(140+3+2)*x

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