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j in (-oo:+oo)
(1/12)*(j+900) = 87.5 // - 87.5
(1/12)*(j+900)-87.5 = 0
1/12*(j+900)-87.5 = 0
1/12*(j+900)-87.5 = 0
1/12*j-12.5 = 0
1/12*j-12.5 = 0
1/12*j-12.5 = 0 // + 12.5
1/12*j = 12.5 // : 1/12
j = 12.5/1/12
j = 150.000006
j = 150.000006
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