3 . ! 2x - 1 ! = 30 - 15
3 . ! 2x - 1 ! = 15
! 2x - 1 ! = 15 : 3
! 2x - 1 ! = 5
=> 2x - 1 = 5 hay 2x - 1 = -5
2x = 5 + 1 hay 2x = -5 + 1
2x = 6 hay 2x = -4
x = 6 : 2 hay x = -4 : 2
x = 3 hay x = -2
\(15+3\left|2x-1\right|=30\)
\(3\left|2x-1\right|=30-15\)
\(3\left|2x-1\right|=15\)
\(\left|2x-1\right|=15:3\)
\(\left|2x-1\right|=5=\left|5\right|=\left|-5\right|\)
+) \(2x-1=5\) +) \(2x-1=-5\)
\(2x=5+1\) \(2x=\left(-5\right)+1\)
\(2x=6\) \(2x=-6\)
\(x=6:2\) \(x=\left(-6\right):2\)
\(x=3\) \(x=-3\)
Vậy x=3 hoặc x=-3
