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d in (-oo:+oo)
-7*d = -7/10 // + -7/10
-7*d-(-7/10) = 0
7/10-7*d = 0
7/10-7*d = 0 // - 7/10
-7*d = -7/10 // : -7
d = -7/10/(-7)
d = 1/10
d = 1/10
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