tanx=x+π/4
    15x＝270
    90-x=1/3（180-x）+6
    0.12x/0.5-0.05/0.5+0.3=1
    x²-240+x=0
    x-75=75%x
    x-25%x=75
    x+75-75%x=100
    x+75-25%x=75%x
    2^x*(16-x)
    7.84+x²=11.2*x
    64^2x=16^x+6
    n^2-21n=-20
    x^3+3x^2+2x+6=0
    (t ^ 2 + 2t + 9) = 0
    n^2-21n＋200=0
    (t ^ 2 + 2t + 9) = 0
     (t-2)(t ^ 2 + 2t + 9) = 0
    (t - 2)(t ^ 2 + 2t + 9) = 0
     (t ^ 2 + 2t + 9) = 0

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