1. Solve the equation: 2x-1 = - x + 5, shift term, get 2x-x = 5-1, then x = 4, the error is -------- cause -------- positive solution———————— 2. Solving equation: x-4 = 7, x-4 = 7 = 4 + 7 = x = 11—————————— 3. Solving the equation （1）8x-1＝7x＋24 （2）5-3y＝-7-4y （3）4（x-1）＝3（x-1)＋1 （4）30＋（80-a）＝1.5（20＋a) (5)3x-[3(x＋1）-（x＋4）]＝1 （6）（1-21%）x-（1＋21%）x＝25% （7）3（2x-1）＋5（1-2x)＋2x＋4＝0

1. Solve the equation: 2x-1 = - x + 5, shift term, get 2x-x = 5-1, then x = 4, the error is -------- cause -------- positive solution———————— 2. Solving equation: x-4 = 7, x-4 = 7 = 4 + 7 = x = 11—————————— 3. Solving the equation （1）8x-1＝7x＋24 （2）5-3y＝-7-4y （3）4（x-1）＝3（x-1)＋1 （4）30＋（80-a）＝1.5（20＋a) (5)3x-[3(x＋1）-（x＋4）]＝1 （6）（1-21%）x-（1＋21%）x＝25% （7）3（2x-1）＋5（1-2x)＋2x＋4＝0

1. Solve the equation: 2x-1 = - x + 5 shift term, get 2x-x = 5-1, then x = 4 wrong in 2x + x = 5 + 1, the reason is positive solution 3x = 6 x = 22, solve the equation: x-4 = 7 x-4 = 7 = 4 + 7 = x = 11 wrong 4 + 7 = x write x = 7 + 4 = 11 (1) 8x-1 = 7x + 248x-7x = 24 + 1x = 25 (2) 5-3y = - 7 -