( 39 + х ) : 15 = 3039 + х = 30 * 1539 + х = 450 450 - 39 = 411х = 411
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450-39=411
Х=411
( 39 + х ) : 15 = 30
39 + х = 30 * 15
39 + х = 450
450 - 39 = 411
х = 411