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j in (-oo:+oo)
(1/5)*(15*j-25) = (2/3)*(11-15) // - (2/3)*(11-15)
(1/5)*(15*j-25)-((2/3)*(11-15)) = 0
(1/5)*(15*j-25)+(-2/3)*(11-15) = 0
1/5*(15*j-25)+8/3 = 0
(1/5*3*(15*j-25))/3+8/3 = 0
1/5*3*(15*j-25)+8 = 0
9*j-7 = 0
(9*j-7)/3 = 0
(9*j-7)/3 = 0 // * 3
9*j-7 = 0
9*j-7 = 0 // + 7
9*j = 7 // : 9
j = 7/9
j = 7/9
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