9+x=2x+12-4x
    3x∧2－48x＋160=0
    (6－2/3x)²－(2/3x)²=x²－(6－x)²
    sin（90-x/2)=2sin(90-5x/2)
    8*sinx/x+cosx=-1
    -0.4x+0.1(25000-x)=2480
    10x+12(28-x)=332
    x＾2-4x
    x^ln4+x^ln10=x^ln25
    3（2.7-x）=5.7+x
    3(2.7-x）=5.7+x
    X^2=533.26*90.04
    90.04/x=x/533.26
    (15+x)^2+(10+x)^2=25^2
    2/5x-1+1=x/2+1
    4x+3=42+1
    2a-a
    x*(x-1)*(x-2)*(x-3)*(x-4)=0
    15x（40÷2－x）＝1125
    4：3x＝4：9

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