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y in (-oo:+oo)
(7/9)*y+5 = 8 // - 8
(7/9)*y-8+5 = 0
7/9*y-3 = 0 // + 3
7/9*y = 3 // : 7/9
y = 3/7/9
y = 27/7
y = 27/7
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