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(-1.4)m=-1
We move all terms to the left:
(-1.4)m-(-1)=0
We add all the numbers together, and all the variables
(-1.4)m+1=0
We multiply parentheses
-1.4m+1=0
We move all terms containing m to the left, all other terms to the right
-1.4m=-1
m=-1/-1.4
m=1/1.4
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