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j in (-oo:+oo)
11.3*j*(4.2-((7/3)*j)) = 0
11.3*j*((-7/3)*j+4.2) = 0
11.3*j*(4.2-7/3*j) = 0
( 11.3*j )
11.3*j = 0 // : 11.3
j = 0
( 4.2-7/3*j )
4.2-7/3*j = 0 // - 4.2
-7/3*j = -4.2 // : -7/3
j = -4.2/(-7/3)
j = 1.8
j in { 0, 1.8 }
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