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0.4r-1=7/8
We move all terms to the left:
0.4r-1-(7/8)=0
We add all the numbers together, and all the variables
0.4r-1-(+7/8)=0
We get rid of parentheses
0.4r-1-7/8=0
We multiply all the terms by the denominator
(0.4r)*8-7-1*8=0
We add all the numbers together, and all the variables
(+0.4r)*8-7-1*8=0
We add all the numbers together, and all the variables
(+0.4r)*8-15=0
We multiply parentheses
0r-15=0
We add all the numbers together, and all the variables
r-15=0
We move all terms containing r to the left, all other terms to the right
r=15
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