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-2(5r+4)=-(r-10)
We move all terms to the left:
-2(5r+4)-(-(r-10))=0
We multiply parentheses
-10r-(-(r-10))-8=0
We calculate terms in parentheses: -(-(r-10)), so:We get rid of parentheses
-(r-10)
We get rid of parentheses
-r+10
We add all the numbers together, and all the variables
-1r+10
Back to the equation:
-(-1r+10)
-10r+1r-10-8=0
We add all the numbers together, and all the variables
-9r-18=0
We move all terms containing r to the left, all other terms to the right
-9r=18
r=18/-9
r=-2
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