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d in (-oo:+oo)
d+3 = -d-((7/3)*d)-10 // + -d-((7/3)*d)-10
d+d+(7/3)*d+3+10 = 0
13/3*d+13 = 0 // - 13
13/3*d = -13 // : 13/3
d = -13/13/3
d = -3
d = -3
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