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(3*30)(8-8)=r
We move all terms to the left:
(3*30)(8-8)-(r)=0
We add all the numbers together, and all the variables
-r+900=0
We add all the numbers together, and all the variables
-1r+900=0
We move all terms containing r to the left, all other terms to the right
-r=-900
r=-900/-1
r=+900
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