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el cuadruplo del numero = 4x
mitad del numero = x/2
4x = 19 +x/2 +30
4x - x/2 = 49
(8x -x)/2 = 49
7x/2 = 49
x = 49*2/7
x = 14
el numero = 14
comprobacion
4( 14) = 19 + 14/2 +30
56 = 19+7+30
56 = 56