Solve for c
c=9
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189-6c-15c=0
Subtract 15c from both sides.
189-21c=0
Combine -6c and -15c to get -21c.
-21c=-189
Subtract 189 from both sides. Anything subtracted from zero gives its negation.
c=\frac{-189}{-21}
Divide both sides by -21.
c=9
Divide -189 by -21 to get 9.
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