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0.4m+4.7+0.8m=-1.3
We move all terms to the left:
0.4m+4.7+0.8m-(-1.3)=0
We add all the numbers together, and all the variables
1.2m+6=0
We move all terms containing m to the left, all other terms to the right
1.2m=-6
m=-6/1.2
m=-5
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