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y in (-oo:+oo)
(-2/5)*y = 4/15 // - 4/15
(-2/5)*y-(4/15) = 0
(-2/5)*y-4/15 = 0
-2/5*y-4/15 = 0 // + 4/15
-2/5*y = 4/15 // : -2/5
y = 4/15/(-2/5)
y = -2/3
y = -2/3
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