\[\boxed{\text{632\ (632).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[\textbf{а)}\ 3 \cdot ( - 2x + 1) - 2 \cdot (x + 13) =\]
\[= 7x - 4 \cdot (1 - x)\]
\[- 6x + 3 - 2x - 26 =\]
\[= 7x - 4 + 4x\]
\[- 6x - 2x - 7x - 4x =\]
\[= 26 - 4 - 3\]
\[- 19x = 19\]
\[x = - 1\]
\[Ответ:x = - 1.\]
\[\textbf{б)} - 4 \cdot (5 - 2a) + 3 \cdot (a - 4) =\]
\[= 6 \cdot (2 - a) - 5a\]
\[- 20 + 8a + 3a - 12 =\]
\[= 12 - 6a - 5a\]
\[8a + 3a + 6a + 5a =\]
\[= 12 + 12 + 20\]
\[22a = 44\]
\[a = 2\]
\[Ответ:\ \ a = 2.\]
\[\textbf{в)}\ 3y(4y - 1) - 2y(6y - 5) =\]
\[= 9y - 8 \cdot (3 + y)\]
\[= 9y - 24 - 8y\]
\[- 3y + 10y - 9y + 8y = - 24\]
\[6y = - 24\]
\[y = - 4\]
\[Ответ:y = - 4.\]
\[\textbf{г)}\ 15x + 6x(2 - 3x) =\]
\[= 9x(5 - 2x) - 36\]
\[15x + 12x - 18x^{2} =\]
\[= 45x - 18x^{2} - 36\]
\[- 18x = - 36\]
\[x = 2\]
\[Ответ:x = 2.\]