(1,-2);m=-1

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Solution for (1,-2);m=-1 equation: 



(1.-2)m=-1

We move all terms to the left:

(1.-2)m-(-1)=0

We add all the numbers together, and all the variables

(-1)m-(-1)=0

We add all the numbers together, and all the variables

(-1)m+1=0

We multiply parentheses

-1m+1=0

We move all terms containing m to the left, all other terms to the right

-m=-1

m=-1/-1

m=1

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