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y in (-oo:+oo)
(-6/5)*(y+1)+y = -13/5 // + -13/5
(-6/5)*(y+1)+y-(-13/5) = 0
(-6/5)*(y+1)+y+13/5 = 0
y-6/5*(y+1)+13/5 = 0
(-6/5*5*(y+1))/5+(5*y)/5+13/5 = 0
5*y-6/5*5*(y+1)+13 = 0
13-y-6 = 0
7-y = 0
(7-y)/5 = 0
(7-y)/5 = 0 // * 5
7-y = 0
7-y = 0 // - 7
-y = -7 // * -1
y = 7
y = 7
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