Question

3 х-9:х-1+х+6:х+1=4

Answer 1

(3х-9)(х+1)+(х+6)(х-1)
------------------------- =4
(х+1)(х-1)

3х^2+3х-9х-9+х^2-х+6х-6=4 (х+1)(х-1)
4 х^2-х-15=4 ( х^2-1)
4х^2-х-15=4 х^2-4
х=-11

Answer 2

общ. знаменатель (х-1)*(х+1)

(3х-9)*(х+1)+(х+6)*(х-1)=4*(х+1)*(х-1)
3$x^{2}$+3х-9х-9+$x^{2}$-х+6х-6=4($x^{2}$-1)
4$x^{2}$-х-15=4$x^{2}$-4
х=-11

Answer 3

спасибо