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20-1-16m=-3m-20
We move all terms to the left:
20-1-16m-(-3m-20)=0
We add all the numbers together, and all the variables
-16m-(-3m-20)+19=0
We get rid of parentheses
-16m+3m+20+19=0
We add all the numbers together, and all the variables
-13m+39=0
We move all terms containing m to the left, all other terms to the right
-13m=-39
m=-39/-13
m=+3
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