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y in (-oo:+oo)
(4/5)*(5*y-15) = -8 // + 8
(4/5)*(5*y-15)+8 = 0
4/5*(5*y-15)+8 = 0
4/5*(5*y-15)+8 = 0
4*y-4 = 0
4*y-4 = 0
4*y-4 = 0 // + 4
4*y = 4 // : 4
y = 4/4
y = 1
y = 1
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