(s+2)^3=-1
    X²+34X=72
    （20+X）（14+X）=
    （20+X）（14+X）=
    X²+34X+280-72=0
    144+（a-2）^2＝a^2
    x^2-34x-300
    x^2-106x-300
    x^2-106x+300
    -x^2+208x+74000
    (x-1974)/x=13.05%
    -3x^4-36x^3-178x^2-420x-300
    -3x^4-36x^3-188x^2-420x-300
    -（1/30）xx+8/3x=8
    -20a^2+840a+5000=0
    x^2+x+1
    （x-60) (-x+100)=(x-75)[-2(x-25)+150]
    sin(x)=3
    (15-x)(400+5x)=4250
    lg(x²+12)=4lg(x)

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