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-r+12=-7r-6(7+8r)
We move all terms to the left:
-r+12-(-7r-6(7+8r))=0
We add all the numbers together, and all the variables
-r-(-7r-6(8r+7))+12=0
We add all the numbers together, and all the variables
-1r-(-7r-6(8r+7))+12=0
We calculate terms in parentheses: -(-7r-6(8r+7)), so:We get rid of parentheses
-7r-6(8r+7)
We multiply parentheses
-7r-48r-42
We add all the numbers together, and all the variables
-55r-42
Back to the equation:
-(-55r-42)
-1r+55r+42+12=0
We add all the numbers together, and all the variables
54r+54=0
We move all terms containing r to the left, all other terms to the right
54r=-54
r=-54/54
r=-1
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