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66=-4(4m-4)+2

We move all terms to the left:

66-(-4(4m-4)+2)=0

We calculate terms in parentheses: -(-4(4m-4)+2), so:We get rid of parentheses

-4(4m-4)+2

We multiply parentheses

-16m+16+2

We add all the numbers together, and all the variables

-16m+18

Back to the equation:

-(-16m+18)

16m-18+66=0

We add all the numbers together, and all the variables

16m+48=0

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

16m=-48

m=-48/16

m=-3

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