Question

решите пожалуйста уравнение 9х-7/4 - 9х+13/8=3х-х/2,,,,6х+7/6+5х-8/9=3

Answer 1

1)
(9x -7)/4 -(9x+13)/8=3x-(x/2)

(2(9x-7) -9x+13)/8 =(6x -x)/2

(18x -14 -9x +13)/8 =5x/2

(9x -1)/8 -5x/2 =0

(9x -1 -5x*4)/8 =0

9x -1 -20x =0

-11x =1
x = -1/11


2)
(6x+7)/6 +(5x -8)/9 =3

(3(6x +7) +2(5x -8))/18 =3

18x +21 +10x -16 =3*18

28x +5 =54

28x =54 -5

28x =49

x =49/28

x =1.75

Answer 2

спасибо

Answer 3

http://znanija.com/task/18841751