(2x−3) 2 =16
    d∧2+4d+6=0
     2/d+1/(d+2)+1/(d+4)=1/(d+1)
    x+2/5x＝2.1
    11x^2-6x-32=0
    4.5=(5X+86)/(X+21)
    d∧2+8d-4=0
    d∧2+8d-4=0
    d∧2+8d-4=0
    d∧2+8d-4=0
    d∧2+8d-4=0
    d∧2+8d-4=0
    d∧2+8d-4=0
    x/x+10=8/9
    1/d+1/(d+1)+1/(d+2)=1/(d+10)
    33:x=30:3
    a/240-0.5=a/（240*4）+3a/（288*4）
    (x+1)^3
    m²+2m+1=2(-1-m)
    99=3.3X

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