Решите уравнение (x+2)^3-x(3x+1)^2+(2x+1)(4x^2-2x+1)=42
(4-x)²+(x-3)²=2x²+4 16-8x+x²+x²-6x+9-2x²-4=0 -14x+21=0 14x=21 x=21/14=3/2=1 1/2