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    1.2X=81.6
    7.5×2X=15
    12X-8X=4.8
    X-0.8X=6
    3200=450+5X+X
    25000+X=6X
    2(X+X+0.5)=9.8
    2(X+X+0.5)=9.8
    (0.5+X)+X=9.8÷2
    sinx/x=0.41545
    x+x÷2=1000
    x+x÷2=3000
    x+x÷2=2000
    7(x-6)=2x
    16-x÷3=12
    16-x÷3=12
    16/103+4/50+X/1000+(75.3-X)/1650=0.294
    17/103+4/50+X/1000+(74.3-X)/1650=0.294
    17/103+3/50+X/1000+(75.3-X)/1650=0.294
    (-4.90/12+Q/12+1.90)*100-(-Q/300+1.90)*100=85*7/12-Q*7/12

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