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y in (-oo:+oo)
16 = (-4/5)*y // - (-4/5)*y
16-((-4/5)*y) = 0
(4/5)*y+16 = 0
4/5*y+16 = 0 // - 16
4/5*y = -16 // : 4/5
y = -16/4/5
y = -20
y = -20
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