\[18ab - 27a + 2b - 3 =\]
\[= 9a(2b - 3) + (2b - 3) =\]
\[= (2b - 3)(9a + 1);\]
\[a = - 1\frac{1}{9} = - \frac{10}{9};b = 1,2:\]
\[(2 \cdot 1,2 - 3)\left( 9 \cdot \left( - \frac{10}{9} \right) + 1 \right) =\]
\[= (2,4 - 3)( - 10 + 1) =\]
\[= - 0,6 \cdot ( - 9) = 5,4.\]