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    x*x-2x-3=0
    0=-1/2x*x+2x+6
    6.5/87-60/1650+X/126=0.00214(X+66.5)
    6.5/87-60/1650+X/126=0.00154(X+66.5)
    5x^2+610x-615
    2(x+5)+3x=35
    6^x=x^18
    x+78=91
    (a-22)(-5a+20)=325
    100-3x=100-4x
    3x=4x
    100-3x=4x
    x/(x+11200)=15%
    sinx*sinx+2cosx=-0.25
    sinx*sinx+2cosx=2
    256627=2400a-a*a/2
    14/87-10/125-60/1650+X/126=0.00154(X+84)
    (2685.13-x/1.01*0.01)*1.12=31219.1-x
    29y-36(69.9-y)=0
    (X+200)*(X+200)-x*x=200000

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