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j in (-oo:+oo)
(-3/14)*j = -9/7 // + -9/7
(-3/14)*j-(-9/7) = 0
(-3/14)*j+9/7 = 0
9/7-3/14*j = 0 // - 9/7
-3/14*j = -9/7 // : -3/14
j = -9/7/(-3/14)
j = 6
j = 6
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