4a+2b+2c=190 how 2a+b+c=95
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4a+2b+2c = 190
2 (2a+b+c)= 190
(2a+b+c) = 190/2
= 95
2 (2a+b+c)= 190
(2a+b+c) = 190/2
= 95
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