12=2(r+1)+4

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Solution for 12=2(r+1)+4 equation: 



12=2(r+1)+4

We move all terms to the left:

12-(2(r+1)+4)=0



We calculate terms in parentheses: -(2(r+1)+4), so:

2(r+1)+4

We multiply parentheses

2r+2+4

We add all the numbers together, and all the variables

2r+6

Back to the equation:

-(2r+6)



We get rid of parentheses

-2r-6+12=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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