Question

The sum of two integers is 65. If one of them is -31, find the other

Answer 1

By assuming Closure property of addition [a+b=c],
Let,
$$a=-31,\ assume\ b=x, c=65$$
$$= -31 + x = 65$$
$$= x = 65+31$$
( By sending -31 from left hand side to the right hand side, it changes to 31)
$$= x = 96$$
By the calculation we got another integer is $$96$$