Пошаговое объяснение:
1. 2,4x + 1 5/7 - 2 2/3x - 5 = 2,4x - 2 2/3x + 1 5/7 -5 = - 4/15 x -3 2/7
1) 2,4x - 2 2/3x =(2 4/10- 2 2/3)x=(2 2/5- 2 2/3)x= (12/5-8/3)x= (36/15- 40/15)x = - 4/15 x
2) 1 5/7 -5= 12/7-35/7= - 23/7 = - 3 2/7
2. -3x - 2 (x - 9) +3 (2x + 2/3) = -3x-2x+18+6x+2 = x+20
