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d in (-oo:+oo)
2*d+2*d-5 = -39/5 // + -39/5
2*d+2*d-(-39/5)-5 = 0
2*d+2*d+39/5-5 = 0
4*d+14/5 = 0 // - 14/5
4*d = -14/5 // : 4
d = -14/5/4
d = -7/10
d = -7/10
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