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6m-7m+6m-16m-16m=-20
We move all terms to the left:
6m-7m+6m-16m-16m-(-20)=0
We add all the numbers together, and all the variables
-27m+20=0
We move all terms containing m to the left, all other terms to the right
-27m=-20
m=-20/-27
m=20/27
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