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y in (-oo:+oo)
(3/2)*y = 6*y+30 // - 6*y+30
(3/2)*y-(6*y)-30 = 0
(3/2)*y-6*y-30 = 0
-9/2*y-30 = 0 // + 30
-9/2*y = 30 // : -9/2
y = 30/(-9/2)
y = -20/3
y = -20/3
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