Răspuns:
a : 6 + 63 = 70
a : 6 = 70 - 63
a : 6 = 7
a = 7 x 6
a = 42
verificare: 42 : 6 + 63 = 70
7+63 = 70
70 = 70 adevarat
a:6=70-63
a:6=7
a=7×6
a=42
Verificare:
42:6+63=7+63=70
