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d in (-oo:+oo)
16-((7*d)/5) = 4 // - 4
16-((7*d)/5)-4 = 0
(-7/5)*d-4+16 = 0
12-7/5*d = 0 // - 12
-7/5*d = -12 // : -7/5
d = -12/(-7/5)
d = 60/7
d = 60/7
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