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y in (-oo:+oo)
(4/9)*(y+3)-8 = 0
4/9*(y+3)-8 = 0
4/9*(y+3)-8 = 0
4/9*y-20/3 = 0
4/9*y-20/3 = 0
4/9*y-20/3 = 0 // + 20/3
4/9*y = 20/3 // : 4/9
y = 20/3/4/9
y = 15
y = 15
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