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-12=7(2r-3)-(8r-9)=r
We move all terms to the left:
-12-(7(2r-3)-(8r-9))=0
We calculate terms in parentheses: -(7(2r-3)-(8r-9)), so:We get rid of parentheses
7(2r-3)-(8r-9)
We multiply parentheses
14r-(8r-9)-21
We get rid of parentheses
14r-8r+9-21
We add all the numbers together, and all the variables
6r-12
Back to the equation:
-(6r-12)
-6r+12-12=0
We add all the numbers together, and all the variables
-6r=0
r=0/-6
r=0
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