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y in (-oo:+oo)
(5/2)*y-((3/7)*y) = 1 // - 1
(5/2)*y-((3/7)*y)-1 = 0
(5/2)*y+(-3/7)*y-1 = 0
29/14*y-1 = 0 // + 1
29/14*y = 1 // : 29/14
y = 1/29/14
y = 14/29
y = 14/29
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