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j in (-oo:+oo)
(4/5)*j-(3/10) = -7/15 // + -7/15
(4/5)*j-(3/10)-(-7/15) = 0
(4/5)*j-3/10+7/15 = 0
4/5*j+1/6 = 0 // - 1/6
4/5*j = -1/6 // : 4/5
j = -1/6/4/5
j = -5/24
j = -5/24
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