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j in (-oo:+oo)
9/12 = j/6.8 // - j/6.8
9/12-(j/6.8) = 0
9/12-0.14705882*j = 0
3/4-0.14705882*j = 0 // - 3/4
-0.14705882*j = -3/4 // : -0.14705882
j = -3/4/(-0.14705882)
j = 5.10000012
j = 5.10000012
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