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j in (-oo:+oo)
(4*j-(3*j))/2 = 42 // - 42
(4*j-(3*j))/2-42 = 0
(4*j-3*j)/2-42 = 0
j/2-42 = 0
j/2+(-42*2)/2 = 0
j-42*2 = 0
j-84 = 0
(j-84)/2 = 0
(j-84)/2 = 0 // * 2
j-84 = 0
j-84 = 0 // + 84
j = 84
j = 84
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