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Solve for r
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3\left(r-1\right)=2\left(2r+1\right)
Multiply both sides of the equation by 6, the least common multiple of 2,3.
3r-3=2\left(2r+1\right)
Use the distributive property to multiply 3 by r-1.
3r-3=4r+2
Use the distributive property to multiply 2 by 2r+1.
3r-3-4r=2
Subtract 4r from both sides.
-r-3=2
Combine 3r and -4r to get -r.
-r=2+3
Add 3 to both sides.
-r=5
Add 2 and 3 to get 5.
r=-5
Multiply both sides by -1.