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j in (-oo:+oo)
(1/2)*(j-6) = 4 // - 4
(1/2)*(j-6)-4 = 0
1/2*(j-6)-4 = 0
1/2*(j-6)-4 = 0
1/2*j-7 = 0
1/2*j-7 = 0
1/2*j-7 = 0 // + 7
1/2*j = 7 // : 1/2
j = 7/1/2
j = 14
j = 14
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