x>(25+0.075*x+0.2*5500+0.00013*x*5500)
    x>(25+0.075*x+0.2*5000+0.00013*x*5000)
    x>(25+0.075*x+0.2*6000+0.00013*x*6000)
    x>(25+0.075*x+0.2*4500+0.00013*x*4500)
    x>2*(25+0.075*x+0.2*2500+0.00013*x*2500)
    x>2*(25+0.075*x+0.2*3200+0.00013*x*3200)
    0.85-0.00026*y>0
    (50+0.4y)/(0.85-0.00026y)>0
    (0.85*x-50)/(40+0.026*x)>0
    (50+40y)/(0.85-0.026y)>0
    60x+150(100-x)≤9800
    2x²-x-3≥0
    1+18*n>(80-n)*18
    x²-8x+16＞0
    x²-8x+16≥0
    x²-8x+16＜0
    x²-8x+16≤0
    x²-2x+1≤0
    x²+3≤4x
    x²+2x+1≤0

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