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y in (-oo:+oo)
(2/5)*y-8 = (3/4)*y+20 // - (3/4)*y+20
(2/5)*y-((3/4)*y)-20-8 = 0
(2/5)*y+(-3/4)*y-20-8 = 0
-7/20*y-28 = 0 // + 28
-7/20*y = 28 // : -7/20
y = 28/(-7/20)
y = -80
y = -80
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