-4(m-1)=20

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Solution for -4(m-1)=20 equation: 



-4(m-1)=20

We move all terms to the left:

-4(m-1)-(20)=0

We multiply parentheses

-4m+4-20=0

We add all the numbers together, and all the variables

-4m-16=0

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

-4m=16

m=16/-4

m=-4

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