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d in (-oo:+oo)
26 = 7*d-4*d-10 // - 7*d-4*d-10
10-(-4*d)-(7*d)+26 = 0
4*d-7*d+10+26 = 0
36-3*d = 0 // - 36
-3*d = -36 // : -3
d = -36/(-3)
d = 12
d = 12
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