5x + 4 = 7x + 2 - 2x
    2x + 1 = 4
    227.76=0.105*X+X
    227.76=0.105/X+X
    227.76-X=0.105/X
    4x=1-1/（1+x）^5
    （227.76-X）/ X=10.5%
    （227.76-X）* X=10.5%
    x:(5.4-x)=5:4
    x/4-2=16
    x%4-2=16
    48-x/x = x / 48
    48-x/48 = x * x / 1
    3y=2(y-1)+1
    30-2x=（30-3x）*4
    -(1-x)*(1-x)*lnX=1
    40-3x=4
    3498.19*tan(20/180)/0.977777777777
    tan(20/360)/0.977777777777
    1+2(x+ 3) = 4 + 4(x - 6) - 7

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