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16+17+18=51
;)
83:2=41,5
41+42= 83
2.
16+17+18=51
;)
x+x+1=83
2x= 83-1 /:2
x=41
41 +1 = 42
41+42=83
2 zad
x+x+1+x+2=51
3x=51-3
3x=48 /:3
x=16
16+1=17
16+2=18
16+17+18=51