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y in (-oo:+oo)
(7/9)*y = -56/99 // + -56/99
(7/9)*y-(-56/99) = 0
(7/9)*y+56/99 = 0
7/9*y+56/99 = 0 // - 56/99
7/9*y = -56/99 // : 7/9
y = -56/99/7/9
y = -8/11
y = -8/11
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