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(-4.2)m=-9
We move all terms to the left:
(-4.2)m-(-9)=0
We add all the numbers together, and all the variables
(-4.2)m+9=0
We multiply parentheses
-4.2m+9=0
We move all terms containing m to the left, all other terms to the right
-4.2m=-9
m=-9/-4.2
m=2+0.6/4.2
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