Solve for C
C=M-J
Solve for J
J=M-C
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M-C=J
Swap sides so that all variable terms are on the left hand side.
-C=J-M
Subtract M from both sides.
\frac{-C}{-1}=\frac{J-M}{-1}
Divide both sides by -1.
C=\frac{J-M}{-1}
Dividing by -1 undoes the multiplication by -1.
C=M-J
Divide J-M by -1.
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