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j in (-oo:+oo)
9 = (6*j-18)/4 // - (6*j-18)/4
9-((6*j-18)/4) = 0
(-1*(6*j-18))/4+9 = 0
(-1*(6*j-18))/4+(4*9)/4 = 0
4*9-1*(6*j-18) = 0
54-6*j = 0
(54-6*j)/4 = 0
(54-6*j)/4 = 0 // * 4
54-6*j = 0
54-6*j = 0 // - 54
-6*j = -54 // : -6
j = -54/(-6)
j = 9
j = 9
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