Solve for λ
\lambda =40
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2\lambda -30=50
Multiply both sides of the equation by 5.
2\lambda =50+30
Add 30 to both sides.
2\lambda =80
Add 50 and 30 to get 80.
\lambda =\frac{80}{2}
Divide both sides by 2.
\lambda =40
Divide 80 by 2 to get 40.
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