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2x²-2x²+6x+4x-7-2-1=0
10x-9-1=0
10x-10=0
10x=10 //:10
x=1
x² + 6x + 9 - (16 - x²) = 2(x² - 2x + 1) + 1
x² + 6x + 9 - 16 + x² = 2x² - 4x + 2 + 1
2x² + 6x - 7 = 2x² - 4x + 3 I - 2x² + 4x + 7
10x = 10 I : 10
x = 1