25-P=2P-10
    25-0.25P=0.5P-20
    -25P-0.5P=-20-25
    1-exp-x
    80-4P+10
    80-4P-10
    80-4P=-40+8P
    4x^2+（x+30）^2＝16x^2
    2∧a+4-2∧a+1=112
    1=x^2+x-1
    ((x^3)^-2)=1000
    y
    1/3（100-x）-1/10x=16
    2/3x+2=3/4（x-3）
    -20*x+16.5=4.5
    5100/x+10000/（x+22.4）+10000/（x+22.4）=150
    x＋32╱x
    ((x^3)^-2)=1000
    （X -4）÷ X =0.79
    X -4÷ X等于0.79

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