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d in (-oo:+oo)
7-(2*d)-(3*d) = -43 // + 43
7-(2*d)-(3*d)+43 = 0
7-2*d-3*d+43 = 0
50-5*d = 0 // - 50
-5*d = -50 // : -5
d = -50/(-5)
d = 10
d = 10
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