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