Question

помогите решить уравнение 3 12
__ -- __ = 1
x x-3

Answer 1

3/х-12/(х-3)=1
(3х-9-12х)=х•(х-3)
х^2-3х+9х+9=0
х^2+6х+9=0
(х+3)^2=0
х+3=0
х=-3