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If particle is acted upon by the forces ...

If particle is acted upon by the forces `vecF_(1) = 2hati + 2hatj - 3hatk" "vecF_(2) = 5hati + chatj - bhatk`
`vecF_(3) = bhati + 5hatj - 7hatk, vecF_(4) = chati + 6hatj - ahatk`. Find the values of the constant a, b, c in ordre that the particle will be in equilibrium.

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The correct Answer is:
a, `-7` b, `-3`, c, `-4`
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