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y in (-oo:+oo)
15 = (5/3)*y // - (5/3)*y
15-((5/3)*y) = 0
(-5/3)*y+15 = 0
15-5/3*y = 0 // - 15
-5/3*y = -15 // : -5/3
y = -15/(-5/3)
y = 9
y = 9
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