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y in (-oo:+oo)
(4*y)/15-1 = 8-((3*y)/5) // - 8-((3*y)/5)
(4*y)/15+(3*y)/5-8-1 = 0
13/15*y-9 = 0 // + 9
13/15*y = 9 // : 13/15
y = 9/13/15
y = 135/13
y = 135/13
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