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y in (-oo:+oo)
1/5-(5*(5*y-15)) = 0
1/5-5*(5*y-15) = 0
(-5*5*(5*y-15))/5+1/5 = 0
1-5*5*(5*y-15) = 0
376-125*y = 0
(376-125*y)/5 = 0
(376-125*y)/5 = 0 // * 5
376-125*y = 0
376-125*y = 0 // - 376
-125*y = -376 // : -125
y = -376/(-125)
y = 376/125
y = 376/125
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