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d in (-oo:+oo)
1*d-((1/5)*d) = 228 // - 228
1*d-((1/5)*d)-228 = 0
d+(-1/5)*d-228 = 0
4/5*d-228 = 0 // + 228
4/5*d = 228 // : 4/5
d = 228/4/5
d = 285
d = 285
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