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j in (-oo:+oo)
25 = (j-15)/3 // - (j-15)/3
25-((j-15)/3) = 0
(-1*(j-15))/3+25 = 0
(-1*(j-15))/3+(3*25)/3 = 0
3*25-1*(j-15) = 0
90-j = 0
(90-j)/3 = 0
(90-j)/3 = 0 // * 3
90-j = 0
90-j = 0 // - 90
-j = -90 // * -1
j = 90
j = 90
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