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y in (-oo:+oo)
(8/9)*y = -40/81 // + -40/81
(8/9)*y-(-40/81) = 0
(8/9)*y+40/81 = 0
8/9*y+40/81 = 0 // - 40/81
8/9*y = -40/81 // : 8/9
y = -40/81/8/9
y = -5/9
y = -5/9
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