@[email protected][email protected][email protected][email protected][email protected][email protected]_sultan09
x²+2x+1=-x²-2x+(-7+2x²)
x²+2x+1= -x²-2x-7+2x²
x²+2x+x²+2x-2x²= -7-1
4x= -8
x= -8:4
x= -2
ответ: -2
@[email protected][email protected][email protected][email protected][email protected][email protected]_sultan09
x²+2x+1=-x²-2x+(-7+2x²)
x²+2x+1= -x²-2x-7+2x²
x²+2x+x²+2x-2x²= -7-1
4x= -8
x= -8:4
x= -2
ответ: -2