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d in (-oo:+oo)
4*d+(1/2)*d-8 = 28 // - 28
4*d+(1/2)*d-28-8 = 0
9/2*d-36 = 0 // + 36
9/2*d = 36 // : 9/2
d = 36/9/2
d = 8
d = 8
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