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j in (-oo:+oo)
-28 = (-1/14)*j // - (-1/14)*j
-((-1/14)*j)-28 = 0
(1/14)*j-28 = 0
1/14*j-28 = 0 // + 28
1/14*j = 28 // : 1/14
j = 28/1/14
j = 392
j = 392
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