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[(a+260:2)×3]+5-12=1997​

Răspuns :

[( a + 260:2) × 3] + 5 - 12 = 1997

[( a + 130 ) × 3 ] + 5 = 1997 + 12

[( a + 130 ) × 3 ] + 5 = 2009 / -5

[( a + 130 ) × 3 ] = 2004

( a + 130 ) = 2004 : 3

a + 130 = 668

a = 668 - 130

a = 538