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j in (-oo:+oo)
2*j-((1/2)*j)-6 = 12 // - 12
2*j-((1/2)*j)-12-6 = 0
2*j+(-1/2)*j-12-6 = 0
3/2*j-18 = 0 // + 18
3/2*j = 18 // : 3/2
j = 18/3/2
j = 12
j = 12
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