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2^x-1 - 2^y = -3
4x+4 + 2y = 20
2x-2 - 2y = -3
4x + 2y = 16
2x - 2y = -1
------------------ +
6x = 15
x = 2,5
2x - 2y = -1
2(2,5) - 2y = -1
5 - 2y = -1
-2y = -6
y = 3