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