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If the sum of a, b, and c, is twice the sum of a minus b and a minus c, then a =
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If the sum of a, b, and c, is twice the sum of a minus b and a minus c, then a =

User Eduardo Santana
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a+b+c = 2(-a -b -c)==> a+b+c =-2a -2b -2c==> a=-2a -2b -2c -b - c

a+2a = - 3b - 3c ==> 3a = -3b - 3c ==> a= -(b+c)/3
User Kaushik Makwana
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