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y in (-oo:+oo)
30 = (-5/2)*y // - (-5/2)*y
30-((-5/2)*y) = 0
(5/2)*y+30 = 0
5/2*y+30 = 0 // - 30
5/2*y = -30 // : 5/2
y = -30/5/2
y = -12
y = -12
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