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3A = 4B
A = (4/3)B
(4/3)B + B = 840
(4/3)B + (3/3)B = 840
(7/3)B = 840
B = (840•3) / 7
B = 2520 / 7
B = 360
A = (4/3)B
A = (4/3)•360
A = (4•360) / 3
A = 1440 / 3
A = 480
ENTONCES
A = 360
B = 480
A + B = 840
360 + 480 = 840
840 = 840