sin(x)+cos(x)=0.2
    sin(x)+cos(x)=1/5
    25x^2+80x-272
    -0.25*x^2+4*x-12=1.5
    3^(2*n-1)+9^n=108
     3^x = x^1
     3^x = x^0
     3^x = x^99
     4^x = x^10
     3^x = x^10
    (0.1*x-0.2)/0.02-(x+1)/0.5=3
     4^x = x^9
    3^x=x^9
    A1/20+A1/30+A1/42=3
    8y²-4y-2=0
    4y²-2y-1=0
    6.25=x*x+0.49
    -2x²+100x-1200=0
    -2x²+100x-400=0
    x/(x+49)=0.1

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