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y in (-oo:+oo)
(2/5)*y-8 = 0-((3/5)*y) // - 0-((3/5)*y)
(2/5)*y+(3/5)*y-8+0 = 0
(2/5)*y+(3/5)*y-8 = 0
y-8 = 0 // + 8
y = 8
y = 8
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