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135=(30+1r)+(30+4r)
We move all terms to the left:
135-((30+1r)+(30+4r))=0
We add all the numbers together, and all the variables
-((r+30)+(4r+30))+135=0
We calculate terms in parentheses: -((r+30)+(4r+30)), so:We get rid of parentheses
(r+30)+(4r+30)
We get rid of parentheses
r+4r+30+30
We add all the numbers together, and all the variables
5r+60
Back to the equation:
-(5r+60)
-5r-60+135=0
We add all the numbers together, and all the variables
-5r+75=0
We move all terms containing r to the left, all other terms to the right
-5r=-75
r=-75/-5
r=+15
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