divide the sum of minus 7 upon 3 and 4 upon 5 by the sum of 3 upon 7 and 2 upon - 9
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find the net electric field of a equilibrium triangle ABC, at its Centroid(1C),whose charges on A is - q, on B is +2q and on C is +2q and the AB=20cm, BC= 20 cm and AC = 20 cm
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