(788*1.2+1200)*4.5*1.4*1.55*45/3<(671*1.16+1200-x)*15/0.85*5*1.44
    (788*1.2+1200)*4.5*1.4*1.55*45/3<(671*1.16+1200-x)*15/0.85*5*1.44
    4x+50<8x+3
    x^2≤0
    x^2>0
    x^2≥0
    x^2<0
    -12500+X-(50000+X)x1%≥5000
    -12500+X-(50000+X)x1%≥5000
    x^2+2*x+3>0
    x^2+2*x+3>0
    x*2+2*x+3>0
    (x+5)/(x^2+2*x+3)>=1
    -e/a>e
    x*0.20833>(1-x)/14
    1/(2+a)>0
    1/(1+a)>0
    12+129>382
    2 x-4<2 3 x-2≥x
    4^4^x≥6^5^5^x

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