-7-2x<0
    4x-20>7x-28
    5x+4>3x+1
    4x-8-2x-5>=-28
    4y^2-2*2y*16+16^2-4*（3*32-3y^2）≥0
    4x-3＜x^2
    5*(3-2x)>0
    x/5≤6/5*x+2
    ((0.3125)^x/0.6875)*1.5<0.000005
    arccosx>45
    X/2+3小于1 -x/5+1
    x>2 x<1
    ((10^（x/10))/300)^(1/1.4)>1
    ((10^(x/10))/300)^(1/1.4)>0.1
    (10^(x/10)/300)^(1/1.4)>0.1
    (325.7+x)*500-(325.7*500)>(325.7*500)*0.00035+(325.7+x)*500*0.00035 x>0.00035*(325.7*2+x)
    -1＜x-2＜1
    (325.7+x)*500-(325.7*500)>(325.7*500)*0.00035+(325.7+x)*500*0.00035
    (x+1)^2(x-7)^3(x+4)(x-5)^4>=0
    (x-2)(x+3)^2(x-4)^3<=0

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