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y in (-oo:+oo)
(-1/3)*y = 4/5 // - 4/5
(-1/3)*y-(4/5) = 0
(-1/3)*y-4/5 = 0
-1/3*y-4/5 = 0 // + 4/5
-1/3*y = 4/5 // : -1/3
y = 4/5/(-1/3)
y = -12/5
y = -12/5
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