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d in (-oo:+oo)
2*(7*d-2) = 94 // - 94
2*(7*d-2)-94 = 0
2*(7*d-2)-94 = 0
14*d-98 = 0
14*d-98 = 0
14*d-98 = 0 // + 98
14*d = 98 // : 14
d = 98/14
d = 7
d = 7
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