（7600/(x+13.44)+10000/(x+22.4)+10000/x)=150
    （7600/(x+11.88)+6700/x+10000/x)=150
    （7600/x+10000/x+10000/x)=150
    （7600/(x+11.76)+10000/x+10000/x)=150
    （7600/(x+11.88)+6700/x+10000/x)=150
    （7600/(x+11.88)+7000/x+10000/x)＝150
    （7600/(x+11.8)+7000/x+10000/x)＝150
    （7600/x+6700/x+10000/x)＝150
    （7600/（x+11.88)+6700/x+10000/x)＝150
    (7600/(x+11.88)+6700/x+10000/x)=150
    (7600/x*1.12+6700+10000)=150
    (5-x)÷7.3+(15-x)÷80＝x÷5.1
    x^0
    3/4x^2+9/4x^2=(12-3x)^2
    100X^2+19x-56 = 0
    100X^2+19x-56=0
    (x-2)^2+(2-6)^2=25
    (x-2)^2+(2-6)^2=25
    ((x^3)^-2)=1000
    (1+n)*(600-20n)=5000

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