7–(2х–2)•(4х+1)=2х(5–4х)
помогите плиз
7-(2x-2)(4x+1)=2x(5-4x) 7-(8x²-8x+2x-2)=10x-8x² 7-8x²+6x+2=10x-8x² 6x+9=10x 10x-6x=9 4x=9 x=9/4 x=2,25