Ответ:

Пошаговое объяснение:

1/15 - 4/(1,5х+1) = -1/3

4/(1,5х+1) = 1/15 - (-1/3)

4/(1,5х+1) = 1/15 - (-5/15)

4/(1,5х+1) = 1/15 + 5/15

4/(1,5х+1) = 6/15

4/(1,5х+1) = 2/5

1,5х + 1 = 4 * 5 / 2

1,5х + 1 = 20/2

1,5х + 1 = 10

1,5х = 10 - 1

1,5х = 9

х = 9 : 1,5

х = 6