When Newton was three, his mother remarried and went to live with her new husband, the Reverend Barnabus Smith, leaving her son in the care of his maternal grandmother, Margery Ayscough. The young Isaac disliked his stepfather and held some enmity towards his mother for marrying him
(5a - 2a) +3
Collect terms: 5a -2a = 3a
3a +3 is the answer because 3a can’t be added to 3 as it’s on its own.
The population declined. Many Eastern Europeans were murdered. Among them Slavs, Jews, Gypsies, etc.
It was "Andreas Vesalius" who was the sixteenth-century physician who published the first accurate and detailed picture of human anatomy, since he was one of the most advanced and knowledgeable surgeons of his time