Solve for c
c=1
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6c+7c+21c+3=37
Combine 40c and -34c to get 6c.
13c+21c+3=37
Combine 6c and 7c to get 13c.
34c+3=37
Combine 13c and 21c to get 34c.
34c=37-3
Subtract 3 from both sides.
34c=34
Subtract 3 from 37 to get 34.
c=\frac{34}{34}
Divide both sides by 34.
c=1
Divide 34 by 34 to get 1.
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