Three forces bar(F(1))=2bar(i)+bar(j)-ba...

Three forces `bar(F_(1))=2bar(i)+bar(j)-bar(k)N`,`bar(F_(2))=2bar(i)+3bar(j)-3bar(k)N`,`bar(F_(3))=a(bar(i)+bar(j)-bar(k))`N act simultaneously on a particle.The value of a so that particle may be in equilibrium is

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