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-5=0.25(4+20r)-8r=-5
We move all terms to the left:
-5-(0.25(4+20r)-8r)=0
We add all the numbers together, and all the variables
-(0.25(20r+4)-8r)-5=0
We calculate terms in parentheses: -(0.25(20r+4)-8r), so:We get rid of parentheses
0.25(20r+4)-8r
We add all the numbers together, and all the variables
-8r+0.25(20r+4)
We multiply parentheses
-8r+5r+1
We add all the numbers together, and all the variables
-3r+1
Back to the equation:
-(-3r+1)
3r-1-5=0
We add all the numbers together, and all the variables
3r-6=0
We move all terms containing r to the left, all other terms to the right
3r=6
r=6/3
r=2
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