cara mengerjakan beserta rumus rumusnya

[tex]1. \: \: |2x - 1| = 7 \\ - 7 = 2x - 1 = 7 \\ - 7 + 1 = 2x = 7 + 1 \\ - 6 = 2x = 8 \\ \frac{ - 6}{2} = x = \frac{8}{8} \\ - 3 = x = 4 \\ x = - 3 \: \: dan \: 4 \\ 2. \: \: |x + 5| = - 6 \\ - ( - 6 )= x + 5 = - 6 \\ 6 - 5 = - 6 - 5 \\ 1 = x = - 11 \\ x = \: 1 \: \: dan \: - 11 \\ 3. \: \: 4x - 8 = 0 \\ 4x = 8 \\ x = 2[/tex]

maaf kalau kurang tepat