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maaf kalau salah
(2)^(-2(4+y)) = 2^ ((y-1)/2))
-2(4+y) = (y-1) /(2)
-4(4+y) = y-1
-16 - 4y = y - 1
- 4y- y = - 1 + 16
-5y = 15
y = -3