-4=-2(-1+r)

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Solution for -4=-2(-1+r) equation: 



-4=-2(-1+r)

We move all terms to the left:

-4-(-2(-1+r))=0

We add all the numbers together, and all the variables

-(-2(r-1))-4=0



We calculate terms in parentheses: -(-2(r-1)), so:

-2(r-1)

We multiply parentheses

-2r+2

Back to the equation:

-(-2r+2)



We get rid of parentheses

2r-2-4=0

We add all the numbers together, and all the variables

2r-6=0

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

2r=6

r=6/2

r=3

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