Lagt inn: 04/08-2012 20:29
[tex]\begin{align} \frac{2}{3}a + a + \frac{3}{4} \left( 2a - \frac{1}{3} \right) - \left( 1 + \frac{3}{2}a \right) + \frac{7}{12} &= \left(\frac{2}{3} + 1 \right) a + \cancel{\frac{3}{2}a} - \frac{1}{4} - 1 - \cancel{\frac{3}{2}a} + \frac{7}{12} \\ &= \frac{5}{3}a + (-3 - 12 + 7)\frac{1}{12} \\ &= \frac{5}{3}a - \frac{2}{3} \end{align}[/tex]