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y in (-oo:+oo)
(5/2)*y+(3*(21-(5/2)))/3 = 0
(5/2)*y+(3*(21-5/2))/3 = 0
5/2*y+37/2 = 0 // - 37/2
5/2*y = -37/2 // : 5/2
y = -37/2/5/2
y = -37/5
y = -37/5
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