Mathematics
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    (12—10)x+(23—15)(100—x)=1300
    5x+30-85=3x+85
    4(2000-x)-12x=7200
    2.16x60
    2.939*sin(x)/x+cos(x)=-1
    2.939*sin(x)/x+cos(x)=1
    (x-50)(200-2x)=800
    2.939*sin(x)/x+cos(x)=-1
    2.939*sin(x)/x+cos(x)=1
    2.182*sin(x)/x+cos(x)=cos(2.262)
    18=BE(BE+7)
    9X+X^2=36
    9*x+x*x=36
    (5+x)*(4+x)=56
    1.76×10^(-5)=x²/(0.02-x)
    1.76×10^(-5)=x²÷(0.02-x)
    (5+x)*(4+x)=56
    cosx+2xsinx=0
    x^3+3x^2-4=0
     x^2-6x-3 = 0

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