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d in (-oo:+oo)
d/5-3.3 = 7.2 // - 7.2
d/5-7.2-3.3 = 0
1/5*d-10.5 = 0 // + 10.5
1/5*d = 10.5 // : 1/5
d = 10.5/1/5
d = 52.5
d = 52.5
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