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5r=-2r-145.
We move all terms to the left:
5r-(-2r-145.)=0
We add all the numbers together, and all the variables
5r-(-2r-145)=0
We get rid of parentheses
5r+2r+145=0
We add all the numbers together, and all the variables
7r+145=0
We move all terms containing r to the left, all other terms to the right
7r=-145
r=-145/7
r=-20+5/7
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