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y in (-oo:+oo)
(2/3)*(4-y) = 6 // - 6
(2/3)*(4-y)-6 = 0
2/3*(4-y)-6 = 0
2/3*(4-y)-6 = 0
-2/3*y-10/3 = 0
-2/3*y-10/3 = 0
-2/3*y-10/3 = 0 // + 10/3
-2/3*y = 10/3 // : -2/3
y = 10/3/(-2/3)
y = -5
y = -5
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