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