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y in (-oo:+oo)
(-2*y)/5-(5/5) = (2*y)/5-y-(10/5) // - (2*y)/5-y-(10/5)
(-2*y)/5-((2*y)/5)+y-(5/5)+10/5 = 0
(-2*y)/5+(-2/5)*y+y+10/5-1 = 0
1/5*y+1 = 0 // - 1
1/5*y = -1 // : 1/5
y = -1/1/5
y = -5
y = -5
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