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-3.5+0.5m=-12
We move all terms to the left:
-3.5+0.5m-(-12)=0
We add all the numbers together, and all the variables
0.5m+8.5=0
We move all terms containing m to the left, all other terms to the right
0.5m=-8.5
m=-8.5/0.5
m=-17
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