Solve for m
m=9
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-1+10m=89
Swap sides so that all variable terms are on the left hand side.
10m=89+1
Add 1 to both sides.
10m=90
Add 89 and 1 to get 90.
m=\frac{90}{10}
Divide both sides by 10.
m=9
Divide 90 by 10 to get 9.
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