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4.5m+2.4m+3=12
We move all terms to the left:
4.5m+2.4m+3-(12)=0
We add all the numbers together, and all the variables
6.9m-9=0
We move all terms containing m to the left, all other terms to the right
6.9m=9
m=9/6.9
m=1+1/3.2857142857143
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