Đáp án:
Giải thích các bước giải:
6)
`(-2)x + 167 = 89`
`(-2)x = 89 - 167`
`(-2)x = -78`
`x = -78 : ( -2 )`
`x = 39 `
7)
`(- 2) . x - 46 = 68`
`( -2) . x = 68 + 46`
`(-2) . x = 114 `
`x = 114 : ( -2 )`
`x = -57`
8)
`3|x+4|=27`
`|x + 4 | = 27 : 3 `
\(\left[ \begin{array}{l}|x + 4 | = 9\\|x + 4 | = -9\end{array} \right.\)
\(\left[ \begin{array}{l}x=5\\x=-13\end{array} \right.\)
9)
`x + 140 = 74`
`x = 74 - 140 `
`x = -66`
10)
`3x + 140 = 74`
`3x = 74 - 140`
`3x = -66`
`x = -66 : 3`
`x = -22`
11)
`(- 3) . x - 58 = 32`
`(- 3) . x = 32 + 58 `
`(- 3) . x = 90 `
`x = 90 : ( -3 )`
`x = -30 `
12)
`4 | x+3 |=28`
` | x + 3 | = 28 : 4 `
\(\left[ \begin{array}{l}|x + 3| = 7\\|x + 3| = -7\end{array} \right.\)
\(\left[ \begin{array}{l}x=4\\x=-10\end{array} \right.\)
13)
`x + 150 = 94`
`x = 94 - 150 `
`x = -56 `
