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