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6m + 6m = -12
12m = -12
Divide both sides by 12. You will get
m = = -1. ANSWER
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As I see from your post, your level in solving equations is equal to zero.
If you want to improve your knowledge, read the lesson
- HOW TO solve a linear equation
in this site.
It is written for beginners ---- so, it may help . . .