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d in (-oo:+oo)
2-6*d = 7*d-37 // - 7*d-37
2-6*d-(7*d)+37 = 0
2-6*d-7*d+37 = 0
39-13*d = 0 // - 39
-13*d = -39 // : -13
d = -39/(-13)
d = 3
d = 3
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