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10=2(r-3)
We move all terms to the left:
10-(2(r-3))=0
We calculate terms in parentheses: -(2(r-3)), so:We get rid of parentheses
2(r-3)
We multiply parentheses
2r-6
Back to the equation:
-(2r-6)
-2r+6+10=0
We add all the numbers together, and all the variables
-2r+16=0
We move all terms containing r to the left, all other terms to the right
-2r=-16
r=-16/-2
r=+8
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