-140=7(1+3r)

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Solution for -140=7(1+3r) equation: 



-140=7(1+3r)

We move all terms to the left:

-140-(7(1+3r))=0

We add all the numbers together, and all the variables

-(7(3r+1))-140=0



We calculate terms in parentheses: -(7(3r+1)), so:

7(3r+1)

We multiply parentheses

21r+7

Back to the equation:

-(21r+7)



We get rid of parentheses

-21r-7-140=0

We add all the numbers together, and all the variables

-21r-147=0

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

-21r=147

r=147/-21

r=-7

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