How many ordered pairs?

How many ordered pairs (a,b) satisfy the following conditions\mathbb{\text{How many ordered pairs (a,b) satisfy the following conditions}}:a×b=a+b(a,b)Z+ab.:\\ \bullet a\times b=a+b\\ \bullet (a,b)\in \mathbb{Z}^{+}\\ \bullet a\neq b.This is an original problem.\mathbb{\text{This is an original problem.}}

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