\[\boxed{\text{29\ (29).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)} - 0,5x(3x - 4) + 15x =\]
\[= 4 \cdot (1,5x + 1) + 3\]
\[- 1,5x + 2 + 15x = 6x + 4 + 3\]
\[- 1,5x + 15x - 6x = 7 - 2\]
\[7,5x = 5\]
\[x = \frac{5}{7,5} = \frac{50}{75}\]
\[x = \frac{2}{3}\]
\[Ответ:x = \frac{2}{3}.\]
\[\textbf{б)}\ (2x - 3)(2x + 3) - x^{2} =\]
\[= 12x - 69 + 3x^{2}\]
\[4x^{2} - 9 - x^{2} = 12x - 69 + 3x^{2}\]
\[4x^{2} - x^{2} - 3x^{2} = 12x - 69 + 9\]
\[12x - 60 = 0\]
\[12x = 60\]
\[x = 5\]
\[Ответ:x = 5.\]
\[\boxed{\text{29.\ }\text{ОК\ ГДЗ\ -\ домашка\ на\ 5}}\]
\[\textbf{а)}\ 5,48(5) < 5,4(85)\]
\[\textbf{б)} - 3,5(61) < - 3,56(1)\]