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j in (-oo:+oo)
(3/4)*j+2/5 = -23/10 // + -23/10
(3/4)*j+2/5-(-23/10) = 0
(3/4)*j+2/5+23/10 = 0
3/4*j+27/10 = 0 // - 27/10
3/4*j = -27/10 // : 3/4
j = -27/10/3/4
j = -18/5
j = -18/5
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