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d in (-oo:+oo)
6*(7*d+4) = 192 // - 192
6*(7*d+4)-192 = 0
6*(7*d+4)-192 = 0
42*d-168 = 0
42*d-168 = 0
42*d-168 = 0 // + 168
42*d = 168 // : 42
d = 168/42
d = 4
d = 4
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