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-9=5.7(16-5r)
We move all terms to the left:
-9-(5.7(16-5r))=0
We add all the numbers together, and all the variables
-(5.7(-5r+16))-9=0
We calculate terms in parentheses: -(5.7(-5r+16)), so:We get rid of parentheses
5.7(-5r+16)
We multiply parentheses
-28.5r+91.2
Back to the equation:
-(-28.5r+91.2)
28.5r-91.2-9=0
We add all the numbers together, and all the variables
28.5r-100.2=0
We move all terms containing r to the left, all other terms to the right
28.5r=100.2
r=100.2/28.5
r=3+1/1.9387755102041
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