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r+20=4(r+2)
We move all terms to the left:
r+20-(4(r+2))=0
We calculate terms in parentheses: -(4(r+2)), so:We get rid of parentheses
4(r+2)
We multiply parentheses
4r+8
Back to the equation:
-(4r+8)
r-4r-8+20=0
We add all the numbers together, and all the variables
-3r+12=0
We move all terms containing r to the left, all other terms to the right
-3r=-12
r=-12/-3
r=+4
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