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y in (-oo:+oo)
4 = (4/9)*y // - (4/9)*y
4-((4/9)*y) = 0
(-4/9)*y+4 = 0
4-4/9*y = 0 // - 4
-4/9*y = -4 // : -4/9
y = -4/(-4/9)
y = 9
y = 9
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