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y in (-oo:+oo)
(7/9)*y = 2/5 // - 2/5
(7/9)*y-(2/5) = 0
(7/9)*y-2/5 = 0
7/9*y-2/5 = 0 // + 2/5
7/9*y = 2/5 // : 7/9
y = 2/5/7/9
y = 18/35
y = 18/35
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