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d in (-oo:+oo)
2*(10-4*d) = -20 // + 20
2*(10-4*d)+20 = 0
2*(10-4*d)+20 = 0
40-8*d = 0
40-8*d = 0
40-8*d = 0 // - 40
-8*d = -40 // : -8
d = -40/(-8)
d = 5
d = 5
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