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y in (-oo:+oo)
(y-8)/2 = (y-5)/5 // - (y-5)/5
(y-8)/2-((y-5)/5) = 0
(y-8)/2+(-1*(y-5))/5 = 0
(5*(y-8))/(2*5)+(-1*2*(y-5))/(2*5) = 0
5*(y-8)-1*2*(y-5) = 0
3*y-30 = 0
(3*y-30)/(2*5) = 0
(3*y-30)/(2*5) = 0 // * 2*5
3*y-30 = 0
3*y-30 = 0 // + 30
3*y = 30 // : 3
y = 30/3
y = 10
y = 10
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