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d in (-oo:+oo)
(1/2)*d+2/5 = -3/5 // + -3/5
(1/2)*d+2/5-(-3/5) = 0
(1/2)*d+2/5+3/5 = 0
1/2*d+1 = 0 // - 1
1/2*d = -1 // : 1/2
d = -1/1/2
d = -2
d = -2
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