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y in (-oo:+oo)
3 = (1/3)*y // - (1/3)*y
3-((1/3)*y) = 0
(-1/3)*y+3 = 0
3-1/3*y = 0 // - 3
-1/3*y = -3 // : -1/3
y = -3/(-1/3)
y = 9
y = 9
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