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d in (-oo:+oo)
5-(3*d) = 3*d-31 // - 3*d-31
5-(3*d)-(3*d)+31 = 0
5-3*d-3*d+31 = 0
36-6*d = 0 // - 36
-6*d = -36 // : -6
d = -36/(-6)
d = 6
d = 6
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