Mathematics
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    abs(x)>0
    364+100×(1+20%)²×(y-3)-640 ≥(90-5)y
    364+100×(1+20%)×(y-3)-640 ≥(90-5)y
    364+100×(1+20%)×(y-3)-640≥(90-5y)
    -450+X-690-0.02X≥500
    (a+3)(a-3)-10a>0
    k(k+14)>-11
     -40+X-0-X*0.01-20 >50
    -40+X-0-X*0.01-20>50
    -40+A-A*4%/4-20≥50
    A-0.01A≥110
    ( 8 - ( ( x - 2.5 ) / 0.1 ) × 0.2 ) * x > 20
    {8-[(x-2.5)/0.1]×0.2}x>=20
    (8-x-2.5/0.1×0.2)x>=20
    x²+2x-3≥0
    x(x-1)≥0
    x²≤1
    (5X-3)÷(2x+5)≤0
    (5X-3)÷(2x+5)≤0
    (5X-3)÷(2x+5)≤0

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