7x = 2x + 4
    7x = 2x + 3 + 1
    50.4%=10.0%+X+10.0%*X
    50.4%=10.0%+r2+10%*r2
    xe^x
    x＾2-4x+20
    2(x-2)-8(x-1)=3(1-x)
    (x-20)*(800-10*x)=8000
    91.2+（20－x）*4.3＝（50+226.6+6.5x）/1.5
    134.4+（23－x）*4.3＝（50+226.6+6.5x）/1.5
    x*(35-2*x)=150
    3x+1=x-7
    2*x*(35-2*x)=150
    2x-(x+10)=5x+2(x-1)
    4x-3(20-x)+4=0
    x/5-（3-2x）/2=x
    x/5-3-2x/2=x
    x-3-2x =x
    X-2.1x=-100
    （100+x）/x=2.1

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