Ответ:
1. 1) (x-6) / (x+9)=7/4
x- 6 = (7x/4) + (63/4)
x=(7x/4)+(87/4)
((-3)x/4) = (87/4)
x = 87/4 / (-3/4)
x = -29
Ответ: x= -29.
2) 4(x-6)=7(x+9)
x=-29
Ответ: x= - 29
2. (x-2,4)/6 = (x+0,6)/11
(x-12/5)/6 = (x+3/5)=11
x/6 = x/11 + 5/11
x = 5//11 / (5/66)
x = 6
Ответ: x= 6