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y in (-oo:+oo)
(6/5)*y-(-3*(1-y-6)) = 0
3*(1-y-6)+(6/5)*y = 0
3*(-y-5)+(6*y)/5 = 0
(3*5*(-y-5))/5+(6*y)/5 = 0
3*5*(-y-5)+6*y = 0
-9*y-75 = 0
(-9*y-75)/5 = 0
(-9*y-75)/5 = 0 // * 5
-9*y-75 = 0
-9*y-75 = 0 // + 75
-9*y = 75 // : -9
y = 75/(-9)
y = -25/3
y = -25/3
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