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d in (-oo:+oo)
(1/2)*d-3 = 2*2 // - 2*2
(1/2)*d-(2*2)-3 = 0
(1/2)*d-4-3 = 0
1/2*d-7 = 0 // + 7
1/2*d = 7 // : 1/2
d = 7/1/2
d = 14
d = 14
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