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y in (-oo:+oo)
4/15 = -y/5 // + -y/5
4/15-(-y/5) = 0
(1/5)*y+4/15 = 0
1/5*y+4/15 = 0 // - 4/15
1/5*y = -4/15 // : 1/5
y = -4/15/1/5
y = -4/3
y = -4/3
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