4(х+2)²-2(х²-4)-(х-2)² = х²
4х²+16х+16-2х²+8-х²+4х-4-х² = 0
20х+20 = 0
20х = -20
х = -20:20
х = -1
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4(х+2)²-2(х²-4)-(х-2)² = х²
4х²+16х+16-2х²+8-х²+4х-4-х² = 0
20х+20 = 0
20х = -20
х = -20:20
х = -1