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y in (-oo:+oo)
(3*(y-5))/5 = -3*y // + -3*y
(3*(y-5))/5-(-3*y) = 0
(3*(y-5))/5+3*y = 0
(3*(y-5))/5+(3*5*y)/5 = 0
3*(y-5)+3*5*y = 0
18*y-15 = 0
(18*y-15)/5 = 0
(18*y-15)/5 = 0 // * 5
18*y-15 = 0
18*y-15 = 0 // + 15
18*y = 15 // : 18
y = 15/18
y = 5/6
y = 5/6
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