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d in (-oo:+oo)
6*(7*d+5) = 240 // - 240
6*(7*d+5)-240 = 0
6*(7*d+5)-240 = 0
42*d-210 = 0
42*d-210 = 0
42*d-210 = 0 // + 210
42*d = 210 // : 42
d = 210/42
d = 5
d = 5
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