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y in (-oo:+oo)
20 = (-8/5)*y // - (-8/5)*y
20-((-8/5)*y) = 0
(8/5)*y+20 = 0
8/5*y+20 = 0 // - 20
8/5*y = -20 // : 8/5
y = -20/8/5
y = -25/2
y = -25/2
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