Решим уравнение:
$$ \frac{1}{2}(3x - 4) = 2\frac{1}{4} - (-x) $$ $$ \frac{3}{2}x - 2 = \frac{9}{4} + x $$ $$ \frac{3}{2}x - x = \frac{9}{4} + 2 $$ $$ \frac{1}{2}x = \frac{9}{4} + \frac{8}{4} $$ $$ \frac{1}{2}x = \frac{17}{4} $$ $$ x = \frac{17}{4} \cdot 2 $$ $$ x = \frac{17}{2} $$ $$ x = 8.5 $$Ответ: x = 8.5