hallo,
1/3 (2-3b)+5/4=2/3(1/2-b) |Klammern lösen
\( \frac{2}{3} \) -b +\( \frac{5}{4} \) =\( \frac{1}{3} \) -\( \frac{2}{3} \) b | -\( \frac{1}{3} \) |; +b
\( \frac{1}{3} \) +\( \frac{5}{4} \) =\( \frac{1}{3} \) b | *3
1 + \( \frac{3*5}{4} \) = b
1 + \( \frac{15}{4} \) = b | 1 = 4/4
\( \frac{4}{4} \) +\( \frac{15}{4} \) = b
\( \frac{19}{4} \) =b b = 4\( \frac{3}{4} \) oder 4,75