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y in (-oo:+oo)
18 = (-3/2)*y // - (-3/2)*y
18-((-3/2)*y) = 0
(3/2)*y+18 = 0
3/2*y+18 = 0 // - 18
3/2*y = -18 // : 3/2
y = -18/3/2
y = -12
y = -12
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