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-4=2(r-5)-16
We move all terms to the left:
-4-(2(r-5)-16)=0
We calculate terms in parentheses: -(2(r-5)-16), so:We get rid of parentheses
2(r-5)-16
We multiply parentheses
2r-10-16
We add all the numbers together, and all the variables
2r-26
Back to the equation:
-(2r-26)
-2r+26-4=0
We add all the numbers together, and all the variables
-2r+22=0
We move all terms containing r to the left, all other terms to the right
-2r=-22
r=-22/-2
r=+11
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