5-1/2 (c-6)=4

Multiply by 2 on both sides, we get

10 - (c - 6) = 8

Now Open the bracket and minus sign outsides the bracket will change signs of terms in the bracket, then

10 - c + 6 = 8

Now add c on both sides, we get

10 -c + c + 6 = 8 + c

10 + 6 = 8 + c

16 = 8 + c

Now Subtract 8 on both sides, we get

16-8 = 8 - 8 + c

8 = c

Hence c = 8

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