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d in (-oo:+oo)
20-((2/10)*d) = (3/10)*d+16 // - (3/10)*d+16
20-((2/10)*d)-((3/10)*d)-16 = 0
(-1/5)*d+(-3/10)*d-16+20 = 0
4-1/2*d = 0 // - 4
-1/2*d = -4 // : -1/2
d = -4/(-1/2)
d = 8
d = 8
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