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    8+x/2=22-x/5
    x/3-4=x/5+12
    x²+(8-x)²=2x²
    400 = x+0.8(550-1.5x)
    400=x+0.8(650-1.5x)
    (120+x)=0.35(300+10x)
    X^2+0.00084X-0.000084=0
    x^5+x^4-x^3-x^2+x+1=0
    x5+x4+-x3-x2+x+1
    X^2=2^X
    3x^3+2x-1=0
    5x=1-(1+x)^9
    (5-x/2-sqrt(4-x^2)/2)^2+(5+x/2-sqrt(4-x^2)/2)^2=64
    X^3+X+5=0
    X/6%-1080000=X/13%
    0.12x+(580-0.12x)=x
    0.12x+0.12x=580
    0.5*4.71*(35*5+65*(14-5))+0.7*0.8*1.77*(330+2.5*(8.5*5+9.5*(14-5))/h*(14-3))=0.5*4129.833+11.486*5+9.719*(14-5)
    0.5*4.71*(35*5+65*(h-5))+0.7*0.8*1.77*(330+2.5*(8.5*5+9.5*(h-5))/h*(h-3))=0.5*4129.833+11.486*5+9.719*(h-5)
    0.5*4.71*(35*5+65*(h-5))+0.7*0.8*1.77*(330+2.5*(8.5*5+9.5*(h-5)/h*(h-3))=0.5*4129.833+11.486*5+9.719*(h-5)

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