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y in (-oo:+oo)
(5*y)/7-((5*y)/9) = 1 // - 1
(5*y)/7-((5*y)/9)-1 = 0
(5*y)/7+(-5/9)*y-1 = 0
10/63*y-1 = 0 // + 1
10/63*y = 1 // : 10/63
y = 1/10/63
y = 63/10
y = 63/10
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