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y in (-oo:+oo)
9 = (8*y)/10 // - (8*y)/10
9-((8*y)/10) = 0
(-4/5)*y+9 = 0
9-4/5*y = 0 // - 9
-4/5*y = -9 // : -4/5
y = -9/(-4/5)
y = 45/4
y = 45/4
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