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

Toán Lớp 8: 6(5-7x)+6(x-9)=12 Ai giúp tớ ik đc ko

Toán Lớp 8: 6(5-7x)+6(x-9)=12
Ai giúp tớ ik đc ko

Comments ( 2 )

  1. 6 (5-7x)+6(x-9)=12
    => 6(−7????+5)+6(????−9)=12
    =>−42????+30+6(????−9)=12
    => −42????+30+6????−54=12
    => −42????−24+6????=12
    => −36????−24=12
    => −36????−24+24=12+24
    => -36????=12+24
    => −36????=36
    => ????= 36: -36
    => ????=−1

  2. 6(5-7x)+6(x-9)=12
    <=>30-42x+6x-54=12
    <=>-36x-24=12
    <=>-36x=12+24
    <=>-36x=36
    <=>x=-1
    Vậy S={-1}
     

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