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1.2m+7.5+2.1=6.3
We move all terms to the left:
1.2m+7.5+2.1-(6.3)=0
We add all the numbers together, and all the variables
1.2m+3.3=0
We move all terms containing m to the left, all other terms to the right
1.2m=-3.3
m=-3.3/1.2
m=-2+0.9/1.2
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