10-х(5-(6+х))=х(х+3)-4х ПОМОГИТЕ СРОЧНО!! !! !! !! !! ! !! ! ! ! !! ! ! ! !!! !! ! ! ! !

Question

10-х(5-(6+х))=х(х+3)-4х ПОМОГИТЕ СРОЧНО!! !! !! !! !! ! !! ! ! ! !! ! ! ! !!! !! ! ! ! !

Answer 1

10-х(5-(6+х)=х(х+3)-4х

10-х(5-6-х)=х^2+3x-4x

10+x+x^2=х^2-x

10+2x=0

2x=-10

x=-5