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d in (-oo:+oo)
-7*d-(7/10) = -637/10 // + -637/10
-7*d-(7/10)-(-637/10) = 0
637/10-7*d-7/10 = 0
63-7*d = 0 // - 63
-7*d = -63 // : -7
d = -63/(-7)
d = 9
d = 9
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