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2.5m+12=19.5
We move all terms to the left:
2.5m+12-(19.5)=0
We add all the numbers together, and all the variables
2.5m-7.5=0
We move all terms containing m to the left, all other terms to the right
2.5m=7.5
m=7.5/2.5
m=3
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