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2r-263=5(-9r-7)+9r
We move all terms to the left:
2r-263-(5(-9r-7)+9r)=0
We calculate terms in parentheses: -(5(-9r-7)+9r), so:We get rid of parentheses
5(-9r-7)+9r
We add all the numbers together, and all the variables
9r+5(-9r-7)
We multiply parentheses
9r-45r-35
We add all the numbers together, and all the variables
-36r-35
Back to the equation:
-(-36r-35)
2r+36r+35-263=0
We add all the numbers together, and all the variables
38r-228=0
We move all terms containing r to the left, all other terms to the right
38r=228
r=228/38
r=6
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