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5.19+-3m=12.63
We move all terms to the left:
5.19+-3m-(12.63)=0
We add all the numbers together, and all the variables
-3m-7.44=0
We move all terms containing m to the left, all other terms to the right
-3m=7.44
m=7.44/-3
m=-2+1/2.08333333333
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