Answer: M = 13
Step-by-step explanation:
Add 4 to both sides to isolate m.
9 = m - 4
9 + 4 = m - 4 + 4
13 = m
Check to see if this is true by plugging the solution back into the equation.
9 = 13 - 4
9 = 9
9=m-4
9+4=m
13=m
9=13-4
9=9
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