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j in (-oo:+oo)
(1/4)*(61-(3*j)) = 25 // - 25
(1/4)*(61-(3*j))-25 = 0
(1/4)*(61-3*j)-25 = 0
1/4*(61-3*j)-25 = 0
1/4*(61-3*j)-25 = 0
-3/4*j-39/4 = 0
-3/4*j-39/4 = 0
-3/4*j-39/4 = 0 // + 39/4
-3/4*j = 39/4 // : -3/4
j = 39/4/(-3/4)
j = -13
j = -13
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