Solve for n
n=M-12
Solve for M
M=n+12
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-n=12-M
Subtract M from both sides.
\frac{-n}{-1}=\frac{12-M}{-1}
Divide both sides by -1.
n=\frac{12-M}{-1}
Dividing by -1 undoes the multiplication by -1.
n=M-12
Divide 12-M by -1.
M=12+n
Add n to both sides.
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