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36-r=-4r-(2r+4)
We move all terms to the left:
36-r-(-4r-(2r+4))=0
We add all the numbers together, and all the variables
-1r-(-4r-(2r+4))+36=0
We calculate terms in parentheses: -(-4r-(2r+4)), so:We get rid of parentheses
-4r-(2r+4)
We get rid of parentheses
-4r-2r-4
We add all the numbers together, and all the variables
-6r-4
Back to the equation:
-(-6r-4)
-1r+6r+4+36=0
We add all the numbers together, and all the variables
5r+40=0
We move all terms containing r to the left, all other terms to the right
5r=-40
r=-40/5
r=-8
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