Question

Jelaskan dan perbaiki kesalahan dalam penyelesaian persamaan di bawah ini.
3x - 4 = 2x + 1
3x - 4 - 2x = 2x + 1 - 2x
x - 4 = 1
x - 4 + 4 = 1 - 4
x = -3

Answer 1

3× - 4 = 2× + 1
3x - 4 - 2x = 2x + 1 - 2x
x - 4 = 1
x - 4 + 4 = 1 + 4
x = 5

atau

3× - 4 = 2× + 1
3× - 2× = 1 + 4
× = 5