Solve for c
c=2
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6=2+2+c
Subtract 2 from 4 to get 2.
6=4+c
Add 2 and 2 to get 4.
4+c=6
Swap sides so that all variable terms are on the left hand side.
c=6-4
Subtract 4 from both sides.
c=2
Subtract 4 from 6 to get 2.
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