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1=-8+r/4
We move all terms to the left:
1-(-8+r/4)=0
We add all the numbers together, and all the variables
-(r/4-8)+1=0
We get rid of parentheses
-r/4+8+1=0
We multiply all the terms by the denominator
-r+8*4+1*4=0
We add all the numbers together, and all the variables
-1r+36=0
We move all terms containing r to the left, all other terms to the right
-r=-36
r=-36/-1
r=+36
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