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-4.5m-7.6-2.5m=6.4
We move all terms to the left:
-4.5m-7.6-2.5m-(6.4)=0
We add all the numbers together, and all the variables
-7m-14=0
We move all terms containing m to the left, all other terms to the right
-7m=14
m=14/-7
m=-2
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