105=7(1-7r)

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Solution for 105=7(1-7r) equation: 



105=7(1-7r)

We move all terms to the left:

105-(7(1-7r))=0

We add all the numbers together, and all the variables

-(7(-7r+1))+105=0



We calculate terms in parentheses: -(7(-7r+1)), so:

7(-7r+1)

We multiply parentheses

-49r+7

Back to the equation:

-(-49r+7)



We get rid of parentheses

49r-7+105=0

We add all the numbers together, and all the variables

49r+98=0

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

49r=-98

r=-98/49

r=-2

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