a+b+c+d=200
! z) K; m7 H) d' g1 ^! Z' c5.39.217.764x-8-16-24=200
5 D, O4 Q, k* w% h% e, G7 O4x-8(1+2+3)=200' V1 E- b4 a5 n7 R7 o8 y8 O
4x-8(6)= 200
6 a+ E9 O# w0 T* z4 I# k* @5.39.217.764x=200+8(6)
$ i* _) @7 M2 y! [8 y5.39.217.76x=248/40 s- m& `1 e _% X( V. ^
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