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d in (-oo:+oo)
2*(7*d-4) = -148 // + 148
2*(7*d-4)+148 = 0
2*(7*d-4)+148 = 0
14*d+140 = 0
14*d+140 = 0
14*d+140 = 0 // - 140
14*d = -140 // : 14
d = -140/14
d = -10
d = -10
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