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y in (-oo:+oo)
15/4 = 3*y // - 3*y
15/4-(3*y) = 0
15/4-3*y = 0
15/4-3*y = 0 // - 15/4
-3*y = -15/4 // : -3
y = -15/4/(-3)
y = 5/4
y = 5/4
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