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y in (-oo:+oo)
(1/2)*(y+5) = (1/15)*y // - (1/15)*y
(1/2)*(y+5)-((1/15)*y) = 0
(1/2)*(y+5)+(-1/15)*y = 0
1/2*(y+5)-y/15 = 0
(1/2*15*(y+5))/15-y/15 = 0
1/2*15*(y+5)-y = 0
13/2*y+75/2 = 0
(13/2*y+75/2)/15 = 0
(13/2*y+75/2)/15 = 0 // * 15
13/2*y+75/2 = 0
13/2*y+75/2 = 0 // - 75/2
13/2*y = -75/2 // : 13/2
y = -75/2/13/2
y = -75/13
y = -75/13
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