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d in (-oo:+oo)
1/5-d = (1/2)*d-89/5 // - (1/2)*d-89/5
1/5-d-((1/2)*d)-(-89/5) = 0
(-1/2)*d-d+1/5+89/5 = 0
18-3/2*d = 0 // - 18
-3/2*d = -18 // : -3/2
d = -18/(-3/2)
d = 12
d = 12
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