2x+6+7=4x+8
2х-4х=8-6-7
-2х=-5
2х=5
х=2.5
Ответ: 2.5
16x^2-24-2x+3-(16x^2-8x+1)=38
(5√2-3)(5√2+3)= ((5√2)²-3²)= 50-9= 41