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x+1
x+2
x+x+1+x+2=84
3x+3=84/-3
3x=81/:3
x=27
27+1=28
27+2=29
spr: 27+28+29=84
:))
x
x+1
x+2
x+x+1+x+2=84
3x+3=84/-3
3x=81/:3
x=27
27+1=28
27+2=29
spr: 27+28+29=84
:)))))