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d in (-oo:+oo)
7*d+3 = 2*d+52/9 // - 2*d+52/9
7*d-(2*d)-(52/9)+3 = 0
7*d-2*d-52/9+3 = 0
5*d-25/9 = 0 // + 25/9
5*d = 25/9 // : 5
d = 25/9/5
d = 5/9
d = 5/9
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