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y in (-oo:+oo)
(13*y)/14-3 = 6-((7*y)/2) // - 6-((7*y)/2)
(13*y)/14+(7*y)/2-6-3 = 0
31/7*y-9 = 0 // + 9
31/7*y = 9 // : 31/7
y = 9/31/7
y = 63/31
y = 63/31
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