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ax + 2 (x + 2) = 4 (x - 1)
↓
2x + 2 (x + 2) = 4 (x - 1)
2x + 2x + 4 = 4x - 4
4x + 4 = 4x - 4
4x - 4x = - 4 - 4
0x = 0 → respuesta