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y in (-oo:+oo)
15 = (-5/9)*y // - (-5/9)*y
15-((-5/9)*y) = 0
(5/9)*y+15 = 0
5/9*y+15 = 0 // - 15
5/9*y = -15 // : 5/9
y = -15/5/9
y = -27
y = -27
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