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-9+m/2=-13
We move all terms to the left:
-9+m/2-(-13)=0
We add all the numbers together, and all the variables
m/2+4=0
We multiply all the terms by the denominator
m+4*2=0
We add all the numbers together, and all the variables
m+8=0
We move all terms containing m to the left, all other terms to the right
m=-8
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