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y in (-oo:+oo)
13 = (-1/6)*y // - (-1/6)*y
13-((-1/6)*y) = 0
(1/6)*y+13 = 0
1/6*y+13 = 0 // - 13
1/6*y = -13 // : 1/6
y = -13/1/6
y = -78
y = -78
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