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y in (-oo:+oo)
2/3 = 4-((2/9)*y) // - 4-((2/9)*y)
(2/9)*y+2/3-4 = 0
2/9*y-10/3 = 0 // + 10/3
2/9*y = 10/3 // : 2/9
y = 10/3/2/9
y = 15
y = 15
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