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19.6=2.2(r+1.2)+2
We move all terms to the left:
19.6-(2.2(r+1.2)+2)=0
We calculate terms in parentheses: -(2.2(r+1.2)+2), so:We get rid of parentheses
2.2(r+1.2)+2
We multiply parentheses
2.2r+2.64+2
We add all the numbers together, and all the variables
2.2r+4.64
Back to the equation:
-(2.2r+4.64)
-2.2r-4.64+19.6=0
We add all the numbers together, and all the variables
-2.2r+14.96=0
We move all terms containing r to the left, all other terms to the right
-2.2r=-14.96
r=-14.96/-2.2
r=6+1/1.25
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