\[\boxed{\text{170\ (170).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1){\ (2x + 3)}^{2} - 2x(5 + 2x) = 10\]
\[4x^{2} + 12x + 9 - 10x - 4x^{2} -\]
\[- 10 = 0\]
\[2x = 10 - 9\]
\[2x = 1\]
\[x = \frac{1}{2} = 0,5\]
\[Ответ:\ x = 0,5.\]
\[2)\ (x - 2)(x - 3) -\]
\[- (x - 6)(x + 1) = 12\]
\[x^{2} - 3x - 2x + 6 - x^{2} -\]
\[- x + 6x + 6 = 12\]
\[0 \cdot x = 12 - 12\]
\[0x = 0\]
\[Ответ:x - любое\ число.\]