x-(x-6500-3655)*0.1-3655=15394
    x^2-59x=2400
    （20+10）*9/7-（1600*20+10x）=8000
    （20+10）*9/7-（1600*20+10x）=8000
    (8m+6)/5*(m-8)/(m+2)+(2m-6)/(m+2)=(8m-64)/5
    (8m+26)/5*(m-8)/(m+2)+(2m-6)/(m+2)=(8m-64)/5
    (8m+26)/5*(m-8)/(m+2)+(2m-6)/m+2=(8m-64)/5
    300/4/5x+3=300/x
    x=-3
    4/3*x=x/3.49+54.8
    -x²+100x+20000
    (3x＋1)＋2x=2(1.5x-1)
    2(x-1)＋1=3x-1
    (3/1-6)-x=3-(4/x＋2)
    2x2-7x+6=0
    5（x2-x）=3（1-x
    3x-7(x-1)=3-2(x＋3)
    4900x^2+6300-489=0
    （1.4X0.8-1）x=15
    x/120-x/140=4

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