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2x - 3(4x - 8) + 4x = 3(5x + 7) + 3x - 21
2x - 12x + 24 + 4x = 15x + 21 + 3x - 21
2x - 12x + 4x - 15x - 3x = 21 - 21 - 24
- 10x + 4x - 15x - 3x= - 24
- 6 - 15x - 3x = - 24
- 21x - 3x = - 24
- 24x = - 24
x = - 24/- 24
x = 1