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    sinx=-0.4
    sinx=-0.7
    a+0.67a=40
    -3x²+5x-4
    x²-3x-10
    -4x²+13
    4x²-13
    X^2+27x-1440
    a^2+(a-4)^2+(a^2-6a)^2+(a^2-6a+8)^2=80
    9/4=81/16-(9/2)x
    80+(a-4)^2+(a^2-6a+8)^2=a^2+(a^2-6a)^2
    6x^3-19x^2+x+6=0
    6x^3-6x^2+x+6+0
    a^4-12a^3+45a^2-52a=0
    ((10x-(330-25+183.36+10)-(10x*0.13-25)*0.1)*0.75)/700 = 0.07
    ((10x-(330-25+183.36+10)-(10x*0.13-25)*0.1)*0.75)/700=0.07
    (526-X)/X=1.916
    sin(2/x)=1.975/x
    2x+x*x=7
    x-140/x=5/7

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