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y in (-oo:+oo)
(4*y)/7-((4*y)/9) = 1 // - 1
(4*y)/7-((4*y)/9)-1 = 0
(4*y)/7+(-4/9)*y-1 = 0
8/63*y-1 = 0 // + 1
8/63*y = 1 // : 8/63
y = 1/8/63
y = 63/8
y = 63/8
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