Răspuns :
( a + 78 ) : 5 + 312 = 332
( a + 78 ) : 5 = 332 - 312
( a + 78 ) : 5 = 20
a + 78 = 20 × 5
a + 78 = 100
a = 100 - 78
a = 22
( a + 78 ) : 5 = 332 - 312
( a + 78 ) : 5 = 20
a + 78 = 20 × 5
a + 78 = 100
a = 100 - 78
a = 22