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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