3c + 2 – (4c – 1 – 9c) = 2c -1
3c+2-4c+1+9c=2c-1
12c-6c=-1-3
6c=-4
C=-4/6
C=-2/3
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Resolver=
3c + 2 – (4c – 1 – 9c) = 2c -1
3c+2-4c+1+9c=2c-1
12c-6c=-1-3
6c=-4
C=-4/6
C=-2/3
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