Given that point a (3x-6,4y + 15) and point B (5Y, x) are symmetric about the X axis, what is the value of X + y?

For X-axis symmetry, then
4y+15=-x
3x-6=5y
The result is: x + 4Y = - 15, 3x-5y = 6
Then, 3x + 12Y = - 45, 17Y = - 51, y = - 3
Then, x = - 3
x+y=-6

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