Solve for r
r=1
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0=r\left(-1\right)+1
Variable r cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by r.
r\left(-1\right)+1=0
Swap sides so that all variable terms are on the left hand side.
r\left(-1\right)=-1
Subtract 1 from both sides. Anything subtracted from zero gives its negation.
r=1
Multiply both sides by -1.
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