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d in (-oo:+oo)
-7 = 2-3*d-(6*d) // - 2-3*d-(6*d)
6*d-(-3*d)-7-2 = 0
3*d+6*d-7-2 = 0
9*d-9 = 0 // + 9
9*d = 9 // : 9
d = 9/9
d = 1
d = 1
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