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2x - 15 = 3(x-15) ........ aplicamos prop distributiva: a(b+c) = ab+ac
2x - 15 = 3x - 3(15)
2x - 15 = 3x - 45
45 - 15 = 3x - 2x
30 = x
Saludos!
2x - 15 = 3x - 45
- 15 + 45 = 3x - 2x
30 = x
Respuesta :
x = 30