{a-(2b+c)}+{b-(2c+a)}+{c-(2a+b)}
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{a -(2b + c)} +{ b -(2c + a)} +{c -(2a +b)}
= a -(2b +c) +b -(2c + a) +c -(2a + b)
= (a + b +c) -{ 2( a+ b +c) +(a + b+c)}
= (a + b +c ) -2(a + b +c) -(a + b +c)
= -2(a + b + c)
= a -(2b +c) +b -(2c + a) +c -(2a + b)
= (a + b +c) -{ 2( a+ b +c) +(a + b+c)}
= (a + b +c ) -2(a + b +c) -(a + b +c)
= -2(a + b + c)
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Hi friend,
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