\[4x(1,5x - 2) + 7 = 3\left( 2x^{2} + 5 \right)\]
\[6x^{2} - 8x + 7 = 6x^{2} + 15\]
\[- 8x = 8\]
\[x = - 1\]
\[Ответ:\ при\ x = - 1.\]