3(r+7)=-(-1+2r)

Solution for 3(r+7)=-(-1+2r) equation:

3(r+7)=-(-1+2r)

We move all terms to the left:

3(r+7)-(-(-1+2r))=0

We add all the numbers together, and all the variables

3(r+7)-(-(2r-1))=0

We multiply parentheses

3r-(-(2r-1))+21=0


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

-(2r-1)

We get rid of parentheses

-2r+1

Back to the equation:

-(-2r+1)


We get rid of parentheses

3r+2r-1+21=0

We add all the numbers together, and all the variables

5r+20=0

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

5r=-20

r=-20/5

r=-4