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y in (-oo:+oo)
(2/5)*y-8 = 9*(-3/5)*y // - 9*(-3/5)*y
(2/5)*y-(9*(-3/5)*y)-8 = 0
(2/5)*y+(27/5)*y-8 = 0
29/5*y-8 = 0 // + 8
29/5*y = 8 // : 29/5
y = 8/29/5
y = 40/29
y = 40/29
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