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-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:We get rid of parentheses
7(3r+1)
We multiply parentheses
21r+7
Back to the equation:
-(21r+7)
-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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