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y in (-oo:+oo)
(3*y)/10-4 = 6-((5*y)/2) // - 6-((5*y)/2)
(3*y)/10+(5*y)/2-6-4 = 0
14/5*y-10 = 0 // + 10
14/5*y = 10 // : 14/5
y = 10/14/5
y = 25/7
y = 25/7
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