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y in (-oo:+oo)
(5*y)/(-2) = 15 // - 15
(5*y)/(-2)-15 = 0
-5/2*y-15 = 0 // + 15
-5/2*y = 15 // : -5/2
y = 15/(-5/2)
y = -6
y = -6
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