7 - х × ( 3 + х ) = ( 2 + х ) × ( 5 - х )
7-3х-х^2=10+5х-2х-х^2 7-3х-х^2=10+3x-x^2 -3x-3x-x^2+x^2=10-7 -6x=3 x= - 3/6 х= - 1/2 х= - 0,5