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d in (-oo:+oo)
7*(3*d-5) = 175 // - 175
7*(3*d-5)-175 = 0
7*(3*d-5)-175 = 0
21*d-210 = 0
21*d-210 = 0
21*d-210 = 0 // + 210
21*d = 210 // : 21
d = 210/21
d = 10
d = 10
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