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j in (-oo:+oo)
(-3/4)*j+2/5 = 7/10 // - 7/10
(-3/4)*j+2/5-(7/10) = 0
(-3/4)*j+2/5-7/10 = 0
-3/4*j-3/10 = 0 // + 3/10
-3/4*j = 3/10 // : -3/4
j = 3/10/(-3/4)
j = -2/5
j = -2/5
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