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80.
81. 18(x+x-200)= 18(2x-200)=36x-3600=36(x-100) odp.D
82. K=x (1+ 4,5/100)= x* 1,045= 1,045x (odp.C)
83. 118/100*1/2*(x+y)= 118/200(x+y) odp.B
84. 100%-25%=75%=0,75
0,75(7l+9p) (odp.B)