Evaluate: {\text{begin}array l 3x+2y=6 } 5x+4y=8\text{end}array .

Expression: $12⁢x^{3}⁢y - 30⁢x^{2}⁢y - 18⁢\left(x⁢y\right)$

Alternate forms

$6⁢x⁢\left(2⁢x + 1\right)⁢\left(x - 3\right)⁢y$