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