A binary operation ⊗ ⊗ defined on the set of integers is such that m ⊗ ⊗ n = m + n + mn for all integers m and n. Find the inverse of -5 under this operatio...

A binary operation $\otimes$ defined on the set of integers is such that m $\otimes$ n = m + n + mn for all integers m and n. Find the inverse of -5 under this operation, if the identity element is 0