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y in (-oo:+oo)
3 = (-8/5)*y // - (-8/5)*y
3-((-8/5)*y) = 0
(8/5)*y+3 = 0
8/5*y+3 = 0 // - 3
8/5*y = -3 // : 8/5
y = -3/8/5
y = -15/8
y = -15/8
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