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y in (-oo:+oo)
28 = (-8/5)*y // - (-8/5)*y
28-((-8/5)*y) = 0
(8/5)*y+28 = 0
8/5*y+28 = 0 // - 28
8/5*y = -28 // : 8/5
y = -28/8/5
y = -35/2
y = -35/2
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