\(A=\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}\)
\(2A=1+\dfrac{1}{2}+\dfrac{1}{4}\)
\(A=2A-A=1-\dfrac{1}{8}=\dfrac{7}{8}\)
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\(A=\dfrac{1}{2}+\dfrac{1}{4}+\dfrac{1}{8}\)
\(2A=1+\dfrac{1}{2}+\dfrac{1}{4}\)
\(A=2A-A=1-\dfrac{1}{8}=\dfrac{7}{8}\)