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d in (-oo:+oo)
3*d+3*d+1 = -11/3 // + -11/3
3*d+3*d-(-11/3)+1 = 0
3*d+3*d+11/3+1 = 0
6*d+14/3 = 0 // - 14/3
6*d = -14/3 // : 6
d = -14/3/6
d = -7/9
d = -7/9
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