1. Bring x=3 into the solution to get a=3.

Take it into the original equation and work out two 3' s and 2' s.

So b is 2, so a+b=5.

2. x for solving the equation is 1 or 5.

When x is 1, a triangle cannot be formed (1+3 is not greater than 4).

Therefore, x is 5, because 3×3+4×4=5×5.

This can form a right triangle.

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