Решите уравнение 2(x+1)²-(x-3)(x+3)=7+x²

Question

Решите уравнение
2(x+1)²-(x-3)(x+3)=7+x²

Answer 1

2*(x+1)²-(x-3)*(x+3)=7+x²
2*(x²+2*x+1)-(x²-9)=7+x²
2*x²+4*x+2-x²+9-7-x²=0
4*x+4=0
4*x=-4
x=-1