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d in (-oo:+oo)
9/10-((1/3)*d) = -5*d-(43/30) // + -5*d-(43/30)
9/10-((1/3)*d)-(-5*d)+43/30 = 0
(-1/3)*d+5*d+9/10+43/30 = 0
14/3*d+7/3 = 0 // - 7/3
14/3*d = -7/3 // : 14/3
d = -7/3/14/3
d = -1/2
d = -1/2
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