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j in (-oo:+oo)
(1/5)*(15*j-25) = 12-15 // - 12-15
(1/5)*(15*j-25)-12+15 = 0
1/5*(15*j-25)-12+15 = 0
1/5*(15*j-25)-12+15 = 0
3*j-17+15 = 0
3*j-2 = 0
3*j-2 = 0
3*j-2 = 0 // + 2
3*j = 2 // : 3
j = 2/3
j = 2/3
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