105=2r+7(r+6)

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Solution for 105=2r+7(r+6) equation: 



105=2r+7(r+6)

We move all terms to the left:

105-(2r+7(r+6))=0



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

2r+7(r+6)

We multiply parentheses

2r+7r+42

We add all the numbers together, and all the variables

9r+42

Back to the equation:

-(9r+42)



We get rid of parentheses

-9r-42+105=0

We add all the numbers together, and all the variables

-9r+63=0

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

-9r=-63

r=-63/-9

r=+7

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