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me comi = x/3
regale =15
tengo 75
x = x/3 +15+75
x -x/3= 90
(3x -x)/3 =90
2x = 90*3
x = 270/2
x = 135
tenia 135 dulces
comprobacion
x = x/3 +15+75
135 = 135/3 +15+75
135 = 45+15+75
135 = 135