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y in (-oo:+oo)
(2/9)*y = 7/18 // - 7/18
(2/9)*y-(7/18) = 0
(2/9)*y-7/18 = 0
2/9*y-7/18 = 0 // + 7/18
2/9*y = 7/18 // : 2/9
y = 7/18/2/9
y = 7/4
y = 7/4
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