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    x=log(10,x+2)
    a×(500-a)=62500
    3x²+16x²-18=0
    (14-8-x)(400+40x)=1920
    8x=164
    100-10x-2x=64
    (20-2x)*5-2x=64
    7200/1.2x-4500/x=10
    0.00000001(1-x)=x^2
    arcsin(2*cos(x-arcsin(sin(40+42/60)/2)))-arcsin(2*cos(x-arcsin(sin(40+33/60)/2)))=6/5*(9/360/60)
    2+x=3
    (x-2)e∧x+(x-1)∧2
    x^3-2x^2=144
    (1000+1500)×x+(300+100)×x ×3=42000
    (1000+1500)×x+(300+100)×x ×3=4.2
    (1000+x)×10+(300+100)×10 ×3=4.2
    (800+x)×8+(300+100)×8 ×3=24000
    (1000+x)×8+(300+100)×8 ×3=24000
    (1000+x)×5+(300+100)×5 ×3=24000
    (1000+x)×10+(300+100)×10 ×3=24000

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