3×1200x=2×2000(38-x)
    3×1200x=2×2000(38-x)
    V=153.42+4.6+0+7.9+0+5.59+5.38%V+15.8
    V=153.42+4.6+0+7.9+0+5.59+5.38%V+15.8
    4×（x÷10）-5×（2650-x）÷13=40
    2100x+2500(50-x)=90000
    6x-4x²
    1500x+2500(50-x)=90000
    1500x+2100(50-x)=90000
    12-x/10=X/6-12
    x^2=81
    2n÷（n+1）=n÷2023
    16372738*x =75477348*8574
    3*x=9
    16 a^2-8 a=0
    （30/1+20/1）y＝4/3
    2×n/n+1=n/2023
    X-12+0.5(x-12)=0.5x
    X×7.5%+(6-X）x5%=0.35
    4046n=n²+n

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