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y in (-oo:+oo)
7*y = 14/9 // - 14/9
7*y-(14/9) = 0
7*y-14/9 = 0
7*y-14/9 = 0 // + 14/9
7*y = 14/9 // : 7
y = 14/9/7
y = 2/9
y = 2/9
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