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-600-240m=-400-280m
We move all terms to the left:
-600-240m-(-400-280m)=0
We add all the numbers together, and all the variables
-240m-(-280m-400)-600=0
We get rid of parentheses
-240m+280m+400-600=0
We add all the numbers together, and all the variables
40m-200=0
We move all terms containing m to the left, all other terms to the right
40m=200
m=200/40
m=5
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