Solve for m
m=\frac{t-15}{8}
Solve for t
t=8m+15
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8m+15=t
Swap sides so that all variable terms are on the left hand side.
8m=t-15
Subtract 15 from both sides.
\frac{8m}{8}=\frac{t-15}{8}
Divide both sides by 8.
m=\frac{t-15}{8}
Dividing by 8 undoes the multiplication by 8.
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