12r-1=2(6+5r)+7

Solution for 12r-1=2(6+5r)+7 equation:

12r-1=2(6+5r)+7

We move all terms to the left:

12r-1-(2(6+5r)+7)=0

We add all the numbers together, and all the variables

12r-(2(5r+6)+7)-1=0


We calculate terms in parentheses: -(2(5r+6)+7), so:

2(5r+6)+7

We multiply parentheses

10r+12+7

We add all the numbers together, and all the variables

10r+19

Back to the equation:

-(10r+19)


We get rid of parentheses

12r-10r-19-1=0

We add all the numbers together, and all the variables

2r-20=0

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

2r=20

r=20/2

r=10