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y in (-oo:+oo)
(1/2)*y+20 = 3*y // - 3*y
(1/2)*y-(3*y)+20 = 0
(1/2)*y-3*y+20 = 0
20-5/2*y = 0 // - 20
-5/2*y = -20 // : -5/2
y = -20/(-5/2)
y = 8
y = 8
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