60n - 12000 <= 80*sqrt(n)
    6n + 8sqrt(n) >= 1200
    30000-0.8n <= 0.8sqrt(n)
    30000-0.8n >= 0.8sqrt(n)
    6n - 30000 >= 0.8sqrt(n)
    k^2+10k-20<0
    4x²-2x+1>0
    -x^2+x+2<0
    -x^2-x+2<2
    2^x>x^4
    2^x
    16x-14/3>0
    1<4-x^<2
    -2x²+x+3≥0
    -10x^2+500x-2000≥0
    5*t*t>1.8
    x+x^3>0
    0x>21
    2x
    8m²+8m+8<0

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