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(2r+4)+90+(r+5)=180
We move all terms to the left:
(2r+4)+90+(r+5)-(180)=0
We add all the numbers together, and all the variables
(2r+4)+(r+5)-90=0
We get rid of parentheses
2r+r+4+5-90=0
We add all the numbers together, and all the variables
3r-81=0
We move all terms containing r to the left, all other terms to the right
3r=81
r=81/3
r=27
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