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    10000/x+10000/(x+102*0.1)=20000/(124+99*0.1)
    10000/x+10000/(x+102*0.1)=20000/(124+99*0.1)
    2(4.64-x)+x=9
    x(10+x)=60
    x/15+0.65=x/12
    x/15+24/60=x/12+15/60
    x²-x+1/4
    80+X=575-450+X*25%
    13.2x-8.5x=70.5
    x-32.5=94
    x÷5.4=1.2
    1.8x=72
    65-5(x+6)=15
    170-120%x=50
    170-120%x=50
    332+32n =400
     510+128n = 10×(110-4n)
    6x-90=4x-15
    6x-15=4x
    √2x=1-2x

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