Răspuns:
( 45 + 24 ) - ( 5×9) = a + ( 6× 7 )
69 - 45 = a + 42
24 = a + 42
a = 42 - 24
a = 18
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Răspuns:
( 45 + 24 ) - ( 5×9) = a + ( 6× 7 )
69 - 45 = a + 42
24 = a + 42
a = 42 - 24
a = 18