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66=3(r-63)
We move all terms to the left:
66-(3(r-63))=0
We calculate terms in parentheses: -(3(r-63)), so:We get rid of parentheses
3(r-63)
We multiply parentheses
3r-189
Back to the equation:
-(3r-189)
-3r+189+66=0
We add all the numbers together, and all the variables
-3r+255=0
We move all terms containing r to the left, all other terms to the right
-3r=-255
r=-255/-3
r=+85
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