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d in (-oo:+oo)
-40 = 8-3*d-(3*d) // - 8-3*d-(3*d)
3*d-(-3*d)-40-8 = 0
3*d+3*d-40-8 = 0
6*d-48 = 0 // + 48
6*d = 48 // : 6
d = 48/6
d = 8
d = 8
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