Solve for λ
\lambda =-1
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1=\lambda +2
Variable \lambda cannot be equal to -2 since division by zero is not defined. Multiply both sides of the equation by \lambda +2.
\lambda +2=1
Swap sides so that all variable terms are on the left hand side.
\lambda =1-2
Subtract 2 from both sides.
\lambda =-1
Subtract 2 from 1 to get -1.
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