1)
[tex]6(x + 4) + 4(x + 11) = 108[/tex]
[tex]6x + 24 + 4x + 44 = 108[/tex]
[tex]10x + 68 = 108[/tex]
[tex]10x = 108 - 68[/tex]
[tex]10x = 40[/tex]
[tex]x = 4[/tex]
2)
[tex]4(6x + 6) - 4(11 + 11) = - 100[/tex]
[tex]24x + 24 - 4 \times 22 = - 100[/tex]
[tex]24x + 24 - 88 = - 100[/tex]
[tex]24x - 64 = - 100[/tex]
[tex]24x = - 100 + 64[/tex]
[tex]24x = - 36[/tex]
[tex]x = - \frac{3}{2} [/tex]
3)
[tex]4 \times (x + 2) + 2 \times (x - 11) = 22[/tex]
[tex]2x \times (x + 2) + x - 11 = 11[/tex]
[tex]2x {}^{2} + 4x + x - 11 = 11 [/tex]
[tex]2x {}^{2} + 5x - 11 = 11[/tex]
[tex]2x {}^{2} + 5x - 11 - 11 = 0 [/tex]
[tex]2x {}^{2} + 5x - 22 = 0 [/tex]
[tex]x1 = \frac{ - 5 - \sqrt{201} }{4} [/tex]
[tex]x2 = \frac{ - 5 + \sqrt{201} }{4} [/tex]
