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15x - 3 = 64
15x = 64 + 3
15x = 67
x = 67/15
Respuesta :
x = 67/15
3 . (x + 1) = 2 (x - 1) + 6
3x + 3 = 2x - 2 + 6
3x - 2x = -2 + 6 - 3
x = 1
Respuesta :
x = 1