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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: 2•(x-5)-3•(x+7)=14 Mong mọi ng j mình

Toán Lớp 6: 2•(x-5)-3•(x+7)=14
Mong mọi ng j mình

Comments ( 2 )

  1. 2 ( x – 5) – 3 ( x + 7) = 14
    2x – 2 . 5 – 3 .x – 3 . 7 = 14
    2x – 10 – 3x – 21 = 14
    ( 2x – 3x) – ( 10 + 21) = 14
    -1x – 31 = 14
    -1x = 14 + 31
    -1x = 45
    x = 45 : (-1)
    x = -45
    #caty09

  2. 2.( x-5)-3.(x+7)=14
    2x-10-3x-21=14
    -x-31=14
    x=-31-14
    ⇒ x=-45
     

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222-9+11+12:2*14+14 = ? ( )

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