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d in (-oo:+oo)
-7*d-3 = 6*d-133 // - 6*d-133
133-7*d-(6*d)-3 = 0
133-7*d-6*d-3 = 0
130-13*d = 0 // - 130
-13*d = -130 // : -13
d = -130/(-13)
d = 10
d = 10
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