Solve for c
c=0
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-c-1-c=-1
Subtract c from both sides.
-c-c=-1+1
Add 1 to both sides.
-c-c=0
Add -1 and 1 to get 0.
-2c=0
Combine -c and -c to get -2c.
c=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -2 is not equal to 0, c must be equal to 0.
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