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d in (-oo:+oo)
10-((4/7)*d) = 22/7 // - 22/7
10-((4/7)*d)-(22/7) = 0
(-4/7)*d-22/7+10 = 0
48/7-4/7*d = 0 // - 48/7
-4/7*d = -48/7 // : -4/7
d = -48/7/(-4/7)
d = 12
d = 12
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