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d in (-oo:+oo)
(1/5)*(d+750) = 350 // - 350
(1/5)*(d+750)-350 = 0
1/5*(d+750)-350 = 0
1/5*(d+750)-350 = 0
1/5*d-200 = 0
1/5*d-200 = 0
1/5*d-200 = 0 // + 200
1/5*d = 200 // : 1/5
d = 200/1/5
d = 1000
d = 1000
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