134-2.{156-6.[54-2.(9+6)]}.x=86

2.{156-6.[54-2.15]}.x=134-86

2.{156-6.[54-30]}.x=48

2.{[156-6.24]}.x=48

2.{[156-144]}.x=48

2.{12}.x=48

24.x=48

x=48:24

x=2

Vậy x=2

Chúc bn học tốt

134 - 2.{ 156 - 6 .[ 54 - 2 .( 9 + 6 )]} . x  = 86

134 - 2.{ 156 - 6 .[ 54 - 2 . 15 ]} . x = 86

134 - 2.{ 156 - 6 .[ 54 - 30 ]} . x= 86

134 - 2.{ 156 - 6 . 24 } . x = 86

134 - 2.{ 156 - 144 } . x = 86

134 - 2 . 12 . x = 86

134 - 24 . x = 86

24 . x = 134 - 86

24 . x = 48

x = 48 : 24

x = 2 

134-2.{156-6.[54-2.(9+6)]}.x=86

<=>134-2.{156-6.[54-2.15]}.x=86

<=>134-2.{156-6.24}.x=86

<=>134-2.12.x=86

<=>134-24.x=86

<=>24.x=134-86

<=>24.x=48

<=>x=48:24

<=>x=2

Vậy...

k mik nhé

Thanks

ko viết lại đề

=> \(2x\left\{156-6\left[54-2.15\right]\right\}=134-86\)

=> \(2x\left\{156-6\left[54-30\right]\right\}=48\)

=> \(2x\left\{156-6.24\right\}=48\)

=> \(2x\left\{156-144\right\}=48\)

=> \(2x.12=48\)

=> \(24x=48\)

=> \(x=48:24=2\)

Vậy \(x\in\left\{2\right\}\)

42 -(2x + 32) + 12 :2 =6

42 - 2x - 32 + 6 = 6

42 - 2x - 32 = 0

42 - 2x = 32

2x = 42 - 32 = 10

x = 5

134 - 2 . {156 - 6.[54 -2.(9+6) ] } x = 86

134 - 2.{ 156 - 6.[54 - 2 . 15 ]} x = 86

134 - 2.{ 156 - 6 . 24} x = 86

134 - 2. 12 .x = 86

134 - 24x = 86

24x = 48

x = 2 

\(42-\left(2x+32\right)+12:2=6\)

\(\Rightarrow42-2x-32=0\)

\(\Rightarrow2x=10\)

\(\Rightarrow x=5\)

134-2{156-6[54-2.(9+6)]}.x=80

=>2.{156-6.[54-2.15]}.x=134-80

=>2.{156-6.[54-30]}.x=54

=>{156-6.24}.x=54:2

=>{156-144}.x=27

=>12.x=27

=>x=27/12