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(6r-3)+45=90
We move all terms to the left:
(6r-3)+45-(90)=0
We add all the numbers together, and all the variables
(6r-3)-45=0
We get rid of parentheses
6r-3-45=0
We add all the numbers together, and all the variables
6r-48=0
We move all terms containing r to the left, all other terms to the right
6r=48
r=48/6
r=8
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