Which of the following equations has the solution \( x= \) all real numbers? \( 4(3-x)+6 x=3 x+12+2 x \) \( 4(3-x)+6 x=3 x+10-x \) \( 4(3-x)+6 x=x+12-3 x \) \( 4(3-x)+6 x=3 x+12-x \)

5. Factorise each of the following expressions by splitting the middle term. \( \begin{array}{ll}\text { (a) } x^{2}+3 x+2 & \text { (b) } x^{2}+5 x+6 \\ \text { (c) } y^{2}-7 y+10 & \text { (d) } y^{2}-8 y-9 \\ \text { (e) } z^{2}+2 z-3 & \text { (f) } z^{2}+14 z-15\end{array} \)

7. Factorise each of the following. (a) \( -x^{2}+5 x-6 \) (b) \( -x^{2}+7 x+8 \) (c) \( -2 x^{2}-11 x-5 \) (d) \( -3 x^{2}-11 x+4 \)

56. Вычислите значение выраже \( \frac{\sqrt{5}+\sqrt{7}}{\sqrt{5}-\sqrt{7}}+\frac{\sqrt{5}-\sqrt{7}}{\sqrt{5}+\sqrt{7}} \).

10. \( \frac{7 x+65}{5}=6 \)

11. \( y-7=-10 \)