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     (t ^ 2 + 2t + 9) = 0
    4x^3+15x^3+16x+6=0
    x^3+3x^2+2x+6=0
    0.6-0.2x=0.3(1-0.7x)
    x²-x=0
    256(1+x)²=400
    -2*x^3+4*x-1=0
    2x
    100-150*(1+d/10)-√(40+50*(1+d/10))=0
    100-150*(1+d/10)-√(40+50*(1+d/10))=2.99
    100-150*(1+d/10)-√(40+50*(1+d/10))=-2.99
    11x+64-2x=100-9x
    (x-2)-(4x-1)=11
    2x-3=-2
    2x+3=-3
    y×7+1=y×8-2
    x^4+x^2+10000=0
    1526210000=13.8*1500x(1000-x/2)
    147000000=13.8*200x*(435-x/2)
    sinx+cosx=

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