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y in (-oo:+oo)
(2/3)*y-9 = 2*y+3 // - 2*y+3
(2/3)*y-(2*y)-9-3 = 0
(2/3)*y-2*y-9-3 = 0
-4/3*y-12 = 0 // + 12
-4/3*y = 12 // : -4/3
y = 12/(-4/3)
y = -9
y = -9
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