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