V15(3V6x+5V2)=4V10x

[tex]\sqrt{15}(3\sqrt6x + 5\sqrt2) = 4\sqrt{10}x\\\\3\sqrt{90}x + 5\sqrt{30} = 4\sqrt{10}x\\\\27\sqrt{10}x +5\sqrt{30} - 3\sqrt{10}x = 0\\\\\sqrt{10}x(27 - 3) = -5\sqrt{30}\\\\24\sqrt{10}x = -5\sqrt{30}\\\\x = -5\sqrt{3}/24[/tex]