✅ التصحيح المفصّل
الخطوة 1 — نلاحظ العامل المشترك \left(\dfrac{2}{5}x + 3\right)
\( 4\left(\dfrac{2}{5}x + 3\right)\left(2x - 2\right) - \left(\dfrac{2}{5}x + 3\right)^{2} \)
\( = \left(\dfrac{2}{5}x + 3\right)\left[4\left(2x - 2\right) - \left(\dfrac{2}{5}x + 3\right)\right] \)
الخطوة 2 — نبسّط القوس الداخلي
\( 4\left(2x - 2\right) - \left(\dfrac{2}{5}x + 3\right) \)
\( = 8x + (-8) - \dfrac{2}{5}x - 3 \)
\( = \dfrac{38}{5}x + (-11) \)
\( \left(\dfrac{2}{5}x + 3\right)\left(\dfrac{38}{5}x - 11\right) \)