Answer:
m=7
Explanation:
1. Simpilfy both sides of the equation & combine like terms
2. Add 12 to both sides
3. Divide 3 from both sides
21 divided by 3 equals 7.
step 1: -3m+6m-12=9
step 2: 3m-12=9
step 3: 3m=21
step 4: m=7
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