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d in (-oo:+oo)
(2/5)*d+6*d+1 = 261/5 // - 261/5
(2/5)*d+6*d-(261/5)+1 = 0
(2/5)*d+6*d-261/5+1 = 0
32/5*d-256/5 = 0 // + 256/5
32/5*d = 256/5 // : 32/5
d = 256/5/32/5
d = 8
d = 8
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