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d in (-oo:+oo)
3*(7*d-5) = 27 // - 27
3*(7*d-5)-27 = 0
3*(7*d-5)-27 = 0
21*d-42 = 0
21*d-42 = 0
21*d-42 = 0 // + 42
21*d = 42 // : 21
d = 42/21
d = 2
d = 2
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