Solve for r
r=-7
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9r-1-10r=6
Subtract 10r from both sides.
-r-1=6
Combine 9r and -10r to get -r.
-r=6+1
Add 1 to both sides.
-r=7
Add 6 and 1 to get 7.
r=-7
Multiply both sides by -1.
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