3(4a+b+2c)
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(5a - 4b) + (2c - 3b - 6c) + a =5a - 4b + 2c - 3b - 6c + a =(5a + a) + (-4b - 3b) + (2c - 6c) =[ 6a - 7b - 4c ].
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3c-d
6c = 18 Therefore, c = 18/6 c = 3
a=2b 4b=6c becomes 2b=3c a=3c