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y in (-oo:+oo)
(-1/3)*y = 3*(2/3) // - 3*(2/3)
(-1/3)*y-(3*(2/3)) = 0
(-1/3)*y-2 = 0
-1/3*y-2 = 0 // + 2
-1/3*y = 2 // : -1/3
y = 2/(-1/3)
y = -6
y = -6
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