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x * y = -156 x + y = 1

x = 1 - y

If we sub the second equation into the first we get:

y(1-y) =-156

y - y^2 = -156

y^2 - y - 156 = 0

(y+12)(y-13)=0

therefore y=-12 or 13

These are the 2 numbers.

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