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d in (-oo:+oo)
1 = (1*d)/10-12 // - (1*d)/10-12
1-((1*d)/10)+12 = 0
1-(d/10)+12 = 0
13-1/10*d = 0 // - 13
-1/10*d = -13 // : -1/10
d = -13/(-1/10)
d = 130
d = 130
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