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d in (-oo:+oo)
(2/3)*(2*d-5) = (5/3)*(4-d)+2 // - (5/3)*(4-d)+2
(2/3)*(2*d-5)-((5/3)*(4-d))-2 = 0
(2/3)*(2*d-5)+(-5/3)*(4-d)-2 = 0
2/3*(2*d-5)-5/3*(4-d)-2 = 0
2/3*(2*d-5)-5/3*(4-d)-2 = 0
3*d-10-2 = 0
3*d-12 = 0
3*d-12 = 0
3*d-12 = 0 // + 12
3*d = 12 // : 3
d = 12/3
d = 4
d = 4
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