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x+15+18-3=42
el valor de la x es = 12
ya que
12+15+18-3 = 42
espero te ayude
x + 15 + 18 - 3 = 42
x + 33 - 3 = 42
x + 30 = 42
x = 42 - 30
x = 12
Respuesta.
x = 12