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y in (-oo:+oo)
(y^1)/4 = 2 // - 2
(y^1)/4-2 = 0
y/4-2 = 0
1/4*y-2 = 0 // + 2
1/4*y = 2 // : 1/4
y = 2/1/4
y = 8
y = 8
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