x^2＝3
    3x＝1
    3a^3-13a^2+6a-18＝0
    7600/(x+112*0.32)+10000/(x+112*0.2)+10000/x=150
    7600/(x+101*0.12)+10000/x+5100/x=150
    7600/(x+101*0.12)+10000/x+7600/x=150
    12.97x=（3.5+x）×7.96
    35.0431=5*0.84*x^15+5x^14+5x^13+5x^12+5*0.72*x^16-1.75（x^10+x^9+x^8+x^7+x^6+x^5+x^4+x^3+x^2+x^1+1)
    0.4x+x=45.8
    4*(6+x)=28
    x²+2x+1=x²+6x+9
    x^3+3*x^2-9*x-15
    2/x
    42x-x=382-13
    4.5*8+x=91
    2.8x-14.4=x+14.4
    (1.7+4x)/1.5=6.6
    7.2-3x=2.46
    0.3x+4.5x=31.2
    55x+49x=520

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