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10=2r-(-4)
We move all terms to the left:
10-(2r-(-4))=0
We calculate terms in parentheses: -(2r-(-4)), so:We get rid of parentheses
2r-(-4)
We add all the numbers together, and all the variables
2r+4
Back to the equation:
-(2r+4)
-2r-4+10=0
We add all the numbers together, and all the variables
-2r+6=0
We move all terms containing r to the left, all other terms to the right
-2r=-6
r=-6/-2
r=+3
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