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3a/b=9+6a
b=3a/(9+6a)
Substitusi
-a/b+2a
=-a/(3a/9+6a)+2a
=(-a(9+6a))/3a + 2a
=(-9a-6a^2)/3a + 2a
=( 3a (-3-2a))/3a + 2a
= -3-2a+2a
= -3
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