7.2/(1.5x)+24/x=120
    7.2/1.5x+24/x=120
    1/3+（1/x+1/60)*24=1
     X = 0.06X+2300
    X=0.06X+2300
    (a*a-2a+12)/a=6
     X=0.06X+2000(1+0.15)
    x/0.5-2=(2x-0.8)/0.4
    2-(x+5)/6=x-(x-1)/3
    (x-7)/5=1-(2x+2)/3
    x/0.3-(0.05-0.1x)/0.02=1
    x/2-(x-2)/6=x-1/3
    x²+92x-1040=0
    x(-2x+9-8/x)=6
    -2x²+9x-6=0
    7x^3+11x^2+17x-3=0
    160000+2x=12x
    100+10x=540-40x
    30+0.1x=0.15x
    （3X+2）/4=8

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