6х(х-1)-2х(3х+2)=-20
7x-6x+7x+4x=-20
1x+11x = -20
12x = -20
x = -20 : 12
x = 20/12
x = 1 8/12
ответ : - 1 8/12
6х(х-1)-2х(3х+2)=-20
7x-6x+7x+4x=-20
1x+11x = -20
12x = -20
x = -20 : 12
x = 20/12
x = 1 8/12
ответ : - 1 8/12