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y in (-oo:+oo)
(13*y)/20-5 = 4-((5*y)/4) // - 4-((5*y)/4)
(13*y)/20+(5*y)/4-5-4 = 0
19/10*y-9 = 0 // + 9
19/10*y = 9 // : 19/10
y = 9/19/10
y = 90/19
y = 90/19
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