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y in (-oo:+oo)
15-((2/3)*y) = -9 // + 9
9-((2/3)*y)+15 = 0
(-2/3)*y+9+15 = 0
24-2/3*y = 0 // - 24
-2/3*y = -24 // : -2/3
y = -24/(-2/3)
y = 36
y = 36
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