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d in (-oo:+oo)
5*d-(2*d)+5 = -28 // + 28
5*d-(2*d)+5+28 = 0
5*d-2*d+5+28 = 0
3*d+33 = 0 // - 33
3*d = -33 // : 3
d = -33/3
d = -11
d = -11
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