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y in (-oo:+oo)
4*(3/4-(2*y)) = 0
4*(3/4-2*y) = 0
3/4-2*y = 0 // - 3/4
-2*y = -3/4 // : -2
y = -3/4/(-2)
y = 3/8
y = 3/8
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