Solve for c
c=17
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3c-9=42
Swap sides so that all variable terms are on the left hand side.
3c=42+9
Add 9 to both sides.
3c=51
Add 42 and 9 to get 51.
c=\frac{51}{3}
Divide both sides by 3.
c=17
Divide 51 by 3 to get 17.
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