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y in (-oo:+oo)
(13/20)*y-6 = y/5+3 // - y/5+3
(13/20)*y-(y/5)-6-3 = 0
9/20*y-9 = 0 // + 9
9/20*y = 9 // : 9/20
y = 9/9/20
y = 20
y = 20
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