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    3(x-2)+1=x-(2x-1)
    120-4(x+5)=25
    30x-10(10-x)=100
    1-(2x+3)=-3
    1-(2x+3x)=-3
    18=BE(BE+7)
    3(x-7)-2(1-x)=22
    40/x+2.5x/160=13
    97x^2-3x-103=0
    x+4=sqrtx
    sqrt(x^2+7)+x^2-4=0
    sqrt(x+4)+sqrt(x-7)=0
    x+1=2
    x^3+2x^2-6x+4=0
    y=e^2
    arctanx+arctan0.25x+arctan80.9x-arctan9.62x=1.57
    arctanx+arctan0.25x+arctan80.9x-arctan9.62x=90
    -arctan(x)-arctan(0.25x)-arctan(80.9x)+arctan(9.62x)=-0.5π
    z^8+0.05z+4=0
    z^5+0.05z+4=0

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