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y in (-oo:+oo)
(2/5)*y-((5/8)*y) = 5/12 // - 5/12
(2/5)*y-((5/8)*y)-(5/12) = 0
(2/5)*y+(-5/8)*y-5/12 = 0
-9/40*y-5/12 = 0 // + 5/12
-9/40*y = 5/12 // : -9/40
y = 5/12/(-9/40)
y = -50/27
y = -50/27
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