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y in (-oo:+oo)
(7*y)/8-((2*y)/9) = 1 // - 1
(7*y)/8-((2*y)/9)-1 = 0
(7*y)/8+(-2/9)*y-1 = 0
47/72*y-1 = 0 // + 1
47/72*y = 1 // : 47/72
y = 1/47/72
y = 72/47
y = 72/47
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