Solve for c
c=54
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12=c-42
The absolute value of a real number a is a when a\geq 0, or -a when a<0. The absolute value of -12 is 12.
c-42=12
Swap sides so that all variable terms are on the left hand side.
c=12+42
Add 42 to both sides.
c=54
Add 12 and 42 to get 54.
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