Solve for c
c=5
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3c-8=7
Combine 4c and -c to get 3c.
3c=7+8
Add 8 to both sides.
3c=15
Add 7 and 8 to get 15.
c=\frac{15}{3}
Divide both sides by 3.
c=5
Divide 15 by 3 to get 5.
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