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y in (-oo:+oo)
-6 = (y-4)/9 // - (y-4)/9
-((y-4)/9)-6 = 0
(-1*(y-4))/9-6 = 0
(-1*(y-4))/9+(-6*9)/9 = 0
-1*(y-4)-6*9 = 0
-y-50 = 0
(-y-50)/9 = 0
(-y-50)/9 = 0 // * 9
-y-50 = 0
-y-50 = 0 // + 50
-y = 50 // * -1
y = -50
y = -50
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