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j in (-oo:+oo)
12*((1/2)*j-4) = -18 // + 18
12*((1/2)*j-4)+18 = 0
12*(1/2*j-4)+18 = 0
12*(1/2*j-4)+18 = 0
6*j-30 = 0
6*j-30 = 0
6*j-30 = 0 // + 30
6*j = 30 // : 6
j = 30/6
j = 5
j = 5
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