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y in (-oo:+oo)
(3/4)*y = y-4 // - y-4
(3/4)*y-y+4 = 0
4-1/4*y = 0 // - 4
-1/4*y = -4 // : -1/4
y = -4/(-1/4)
y = 16
y = 16
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