5x+15=25+8x-2
    (x-600-300)/7000=(x-256-368)/6360
    x-600-300/7000=x-256-368/6360
    x+2/30=1-x/40
    x^1.28=1
    3x+6=48
    2x+8
    (2-x)^2+9/4=x^2
    (1350-8.4x^2) /(x+0.509)^2 +66.6=210.553
    (1350-8.4x)^2 /(x+0.509)^2 +66.6=210.553
    160x=240×（30-x）
    x∧0.66=16.38÷48.8
    (110-x)*(10+x)=3500
    36-6a=a^2
    36-6a=a*a
    2(10-0.5y)=-(1.5y+2)
    x+1-2(x-1)=1-3x
    2(x+1)=1-(x+3)
    （x-1）ln x
    （x-1）ln x

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