Solve for c
c=0
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-c-\left(-4\right)=4
To find the opposite of c-4, find the opposite of each term.
-c+4=4
The opposite of -4 is 4.
-c=4-4
Subtract 4 from both sides.
-c=0
Subtract 4 from 4 to get 0.
c=0
Product of two numbers is equal to 0 if at least one of them is 0. Since -1 is not equal to 0, c must be equal to 0.
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