((X-2108)-517)+818=818
X-2108-517=0 x=2108+517 x=2625
((Х-2108)-517)+818=818 (Х-2108)-517=818-818 (Х-2108)-517=0 Х-2108=0+517 Х-2108=517 Х=2108+517 Х=2725