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-1=10+r/9
We simplify the equation to the form, which is simple to understand
-1=10+r/9
Simplifying:
-1=10 + 0.111111111111r
We move all terms containing r to the left and all other terms to the right.
-0.111111111111r=+10+1
We simplify left and right side of the equation.
-0.111111111111r=+11
We divide both sides of the equation by -00.111111111111 to get r.
r=-99.0000000001
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