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2/3 x + 3/4 x + 1/12 x = 144
3/2 x = 144
x = 144 : 3/2
x = 96
verifiquemos
2/3 de 96 = 64
3/4 de 96 = 72
1/12 de 96= 8
64 + 72 + 8 = 144
saludos