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j in (-oo:+oo)
40*j-(5*j)+3/6+3 = 0
40*j-5*j+3/6+3 = 0
35*j+7/2 = 0 // - 7/2
35*j = -7/2 // : 35
j = -7/2/35
j = -1/10
j = -1/10
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