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(0.4)m=-3
We move all terms to the left:
(0.4)m-(-3)=0
We add all the numbers together, and all the variables
(0.4)m+3=0
We multiply parentheses
0.4m+3=0
We move all terms containing m to the left, all other terms to the right
0.4m=-3
m=-3/0.4
m=-7+0.2/0.4
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