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4(m+13)=-20
We move all terms to the left:
4(m+13)-(-20)=0
We add all the numbers together, and all the variables
4(m+13)+20=0
We multiply parentheses
4m+52+20=0
We add all the numbers together, and all the variables
4m+72=0
We move all terms containing m to the left, all other terms to the right
4m=-72
m=-72/4
m=-18
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