a) x = 2/3 + 5/9
x = 11/9
b) x = 6/21 + 3/7
x = 5/7
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\(x-\dfrac{5}{9}=\dfrac{2}{3}\)
\(x=\dfrac{2}{3}+\dfrac{5}{9}\)
\(x=\dfrac{11}{9}\)
\(x-\dfrac{3}{7}=\dfrac{6}{21}\)
\(x=\dfrac{6}{21}+\dfrac{3}{7}\)
\(x=\dfrac{15}{21}=\dfrac{5}{7}\)
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