As, mod is positive as well as negative . So we have two cases here, |4x – 8| = 9x + 2 First case: (positive value). 4x – 8 = 9x + 2 Re arranging the equation: 9x-4x = -8-2 5x = -10 x = –2 Second case: (negative value). –(4x – 8) = 9x + 2 –4x + 8 = 9x + 2 Re arranging the equation. 6 = 13x x = 6/13