Solve for g
g=\frac{M-e}{8}
Solve for M
M=8g+e
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8g+e=M
Swap sides so that all variable terms are on the left hand side.
8g=M-e
Subtract e from both sides.
\frac{8g}{8}=\frac{M-e}{8}
Divide both sides by 8.
g=\frac{M-e}{8}
Dividing by 8 undoes the multiplication by 8.
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