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y in (-oo:+oo)
13 = (1/3)*y // - (1/3)*y
13-((1/3)*y) = 0
(-1/3)*y+13 = 0
13-1/3*y = 0 // - 13
-1/3*y = -13 // : -1/3
y = -13/(-1/3)
y = 39
y = 39
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