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0.4m+3.5=5.1
We move all terms to the left:
0.4m+3.5-(5.1)=0
We add all the numbers together, and all the variables
0.4m-1.6=0
We move all terms containing m to the left, all other terms to the right
0.4m=1.6
m=1.6/0.4
m=4
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