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y in (-oo:+oo)
y-(8/(-4))-9 = (5*y)/8 // - (5*y)/8
y-((5*y)/8)-(8/(-4))-9 = 0
y+(-5/8)*y-9+2 = 0
3/8*y-7 = 0 // + 7
3/8*y = 7 // : 3/8
y = 7/3/8
y = 56/3
y = 56/3
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