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-(3r/4)+8=20
We move all terms to the left:
-(3r/4)+8-(20)=0
We add all the numbers together, and all the variables
-(+3r/4)+8-20=0
We add all the numbers together, and all the variables
-(+3r/4)-12=0
We get rid of parentheses
-3r/4-12=0
We multiply all the terms by the denominator
-3r-12*4=0
We add all the numbers together, and all the variables
-3r-48=0
We move all terms containing r to the left, all other terms to the right
-3r=48
r=48/-3
r=-16
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