Answer:
a = [tex]\frac{b^2}{1-2b}[/tex]
Step-by-step explanation:
given
[tex]\frac{a}{b}[/tex] - 2a = b ( multiply through by b to clear the fraction )
a - 2ab = b² ( factor out a from each term on the left side )
a(1 - 2b) = b² ← divide both sides by (1 - 2b )
a = [tex]\frac{b^2}{1-2b}[/tex]